Change Array to Object with recursives

Change Array to Object with recursives - javascript

i have an array shared below. I need to change this array like an object. I tried something but cant make it. I Want to make like this with foreach or recursive functions.
let nodes= [
{ id: 1, name: "Denny Curtis", title: "CEO", img: "https://cdn.balkan.app/shared/2.jpg" },
{ id: 2, pid: 1, name: "Ashley Barnett", title: "Sales Manager", img: "https://cdn.balkan.app/shared/3.jpg" },
{ id: 3, pid: 1, name: "Caden Ellison", title: "Dev Manager", img: "https://cdn.balkan.app/shared/4.jpg" }
];
let newObj = {
"id": 1,
"name": "Denny Curtis",
"title": "CEO",
"img": "https://cdn.balkan.app/shared/2.jpg",
"children": [
{
"id": 2,
"pid": 1,
"name": "Ashley Barnett",
"title": "Sales Manager",
"img": "https://cdn.balkan.app/shared/3.jpg",
"children": [
{
"id": 4,
"pid": 2,
"name": "Elliot Patel",
"title": "Sales",
"img": "https://cdn.balkan.app/shared/5.jpg"
},
{
"id": 5,
"pid": 2,
"name": "Lynn Hussain",
"title": "Sales",
"img": "https://cdn.balkan.app/shared/6.jpg"
}
]
}
]
}
Thank you from now.

It would probably be better to make an array of users with the children related to them.
let nodes = [{
id: 1,
name: "Denny Curtis",
title: "CEO",
img: "https://cdn.balkan.app/shared/2.jpg"
},
{
id: 2,
pid: 1,
name: "Ashley Barnett",
title: "Sales Manager",
img: "https://cdn.balkan.app/shared/3.jpg"
},
{
id: 3,
pid: 1,
name: "Caden Ellison",
title: "Dev Manager",
img: "https://cdn.balkan.app/shared/4.jpg"
}
];
let newNodeArray = [];
nodes.forEach(node=>{
newNodeArray.push({...node,children: nodes.filter(filterNode => filterNode.pid === node.id )});
});
console.log(JSON.stringify(newNodeArray));
The outcome of this one would look like:
[
{
"id":1,
"name":"Denny Curtis",
"title":"CEO",
"img":"https://cdn.balkan.app/shared/2.jpg",
"children":[
{
"id":2,
"pid":1,
"name":"Ashley Barnett",
"title":"Sales Manager",
"img":"https://cdn.balkan.app/shared/3.jpg"
},
{
"id":3,
"pid":1,
"name":"Caden Ellison",
"title":"Dev Manager",
"img":"https://cdn.balkan.app/shared/4.jpg"
}
]
},
{
"id":2,
"pid":1,
"name":"Ashley Barnett",
"title":"Sales Manager",
"img":"https://cdn.balkan.app/shared/3.jpg",
"children":[]
},
{
"id":3,
"pid":1,
"name":"Caden Ellison",
"title":"Dev Manager",
"img":"https://cdn.balkan.app/shared/4.jpg",
"children":[]
}
]
//This is how you would do it if you want the response to be an object
let nodeObject = {...nodes.filter(node=>!node.pid)[0],children:[]};
nodeObject.children = nodes.filter(node=>nodeObject.id === node.pid);
nodeObject.children = nodeObject.children.map(node=>({...node,children: nodes.filter(filterNode=>node.id === filterNode.pid)}));
console.log(nodeObject);
// The Response for this would be:
{
"id": 1,
"name": "Denny Curtis",
"title": "CEO",
"img": "https://cdn.balkan.app/shared/2.jpg",
"children": [{
"id": 2,
"pid": 1,
"name": "Ashley Barnett",
"title": "Sales Manager",
"img": "https://cdn.balkan.app/shared/3.jpg",
"children": [{
"id": 4,
"pid": 2,
"name": "Caden Ellison",
"title": "Sales",
"img": "https://cdn.balkan.app/shared/4.jpg"
}]
}, {
"id": 3,
"pid": 1,
"name": "Caden Ellison",
"title": "Dev Manager",
"img": "https://cdn.balkan.app/shared/4.jpg",
"children": []
}]
}

Related

How to map according to key on objects?

I'm trying to map through object values and add text if the key is right on JavaScript. Here is our object:
{
"id": "n27",
"name": "Thomas More",
"className": "level-1",
"children": [
{
"id": "n1",
"name": "Rousseau",
"className": "level-2",
"children": [
{
"id": "n2",
"name": "Machiavelli",
"className": "level-3",
"children": [
{
"id": "n9",
"name": "Edison, Thomas",
"className": "level-4"
}
]
}
]
},
{
"id": "n3",
"name": "Einstein",
"className": "level-2",
"children": [
{
"id": "n10",
"name": "Arf, Cahit",
"className": "level-3",
"children": [
{
"id": "n15",
"name": "Rawls, John",
"className": "level-4"
}
]
},
{
"id": "n12",
"name": "Smith, Adam",
"className": "level-3",
"children": [
{
"id": "n11",
"name": "Kant, Immanuel",
"className": "level-4"
}
]
}
]
},
{
"id": "n60",
"name": "Turing, Alan",
"className": "level-2"
}
]
}
I want to add " YES" to their className's. So new object should look like this:
{
"id": "n27",
"name": "Thomas More",
"className": "level-1 YES",
"children": [
{
"id": "n1",
"name": "Rousseau",
"className": "level-2 YES",
"children": [
{
"id": "n2",
"name": "Machiavelli",
"className": "level-3 YES",
"children": [
{
"id": "n9",
"name": "Edison, Thomas",
"className": "level-4 YES"
}
]
}
]
},
{
"id": "n3",
"name": "Einstein",
"className": "level-2 YES",
"children": [
{
"id": "n10",
"name": "Arf, Cahit",
"className": "level-3 YES",
"children": [
{
"id": "n15",
"name": "Rawls, John",
"className": "level-4 YES"
}
]
},
{
"id": "n12",
"name": "Smith, Adam",
"className": "level-3 YES",
"children": [
{
"id": "n11",
"name": "Kant, Immanuel",
"className": "level-4 YES"
}
]
}
]
},
{
"id": "n60",
"name": "Turing, Alan",
"className": "level-2 YES"
}
]
}
I have tried this, but it adds to all of the keys:
const addToClassName = (datasource, fn) => {
return Object.fromEntries(Object
.entries(datasource, fn)
.map(([k, v]) => [k, v && v.children != undefined && v.children.length > 0 ? addToClassName(v.children, fn) : fn(v)])
);
}
let res = addToClassName(obj, v => v + ' YEP');
How can I do it?

You don't need to use Object.fromEntries(), instead, you make your function return a new object, with a transformed className based on the return value of fn. You can then set the children: key on the object to be a mapped version of all the objects inside of the children array. When mapping, you can pass each child into the recursive call to your addToClassName() function. You can add the children key conditionally to the output object but checking if it exists (with children &&) and then by spreading the result using the spread syntax ...:
const data = { "id": "n27", "name": "Thomas More", "className": "level-1", "children": [ { "id": "n1", "name": "Rousseau", "className": "level-2", "children": [ { "id": "n2", "name": "Machiavelli", "className": "level-3", "children": [ { "id": "n9", "name": "Edison, Thomas", "className": "level-4" } ] } ] }, { "id": "n3", "name": "Einstein", "className": "level-2", "children": [ { "id": "n10", "name": "Arf, Cahit", "className": "level-3", "children": [ { "id": "n15", "name": "Rawls, John", "className": "level-4" } ] }, { "id": "n12", "name": "Smith, Adam", "className": "level-3", "children": [ { "id": "n11", "name": "Kant, Immanuel", "className": "level-4" } ] } ] }, { "id": "n60", "name": "Turing, Alan", "className": "level-2" } ] };
const addToClassName = (obj, fn) => ({
...obj,
className: fn(obj.className),
...(obj.children && {children: obj.children.map(child => addToClassName(child, fn))})
});
console.log(addToClassName(data, v => v + " YES"));

If you can change the current obj object then you can achieve this using recursion as
function addClass(obj) {
obj.className += " YES";
obj.children && obj.children.forEach(addClass);
}
const obj = {
id: "n27",
name: "Thomas More",
className: "level-1",
children: [
{
id: "n1",
name: "Rousseau",
className: "level-2",
children: [
{
id: "n2",
name: "Machiavelli",
className: "level-3",
children: [
{
id: "n9",
name: "Edison, Thomas",
className: "level-4",
},
],
},
],
},
{
id: "n3",
name: "Einstein",
className: "level-2",
children: [
{
id: "n10",
name: "Arf, Cahit",
className: "level-3",
children: [
{
id: "n15",
name: "Rawls, John",
className: "level-4",
},
],
},
{
id: "n12",
name: "Smith, Adam",
className: "level-3",
children: [
{
id: "n11",
name: "Kant, Immanuel",
className: "level-4",
},
],
},
],
},
{
id: "n60",
name: "Turing, Alan",
className: "level-2",
},
],
};
function addClass(obj) {
obj.className += " YES";
obj.children && obj.children.forEach(addClass);
}
addClass(obj);
console.log(obj);

You can use lodash, if don't mind.
const _ = require('lodash');
const data = { "id": "n27", "name": "Thomas More", "className": "level-1", "children": [ { "id": "n1", "name": "Rousseau", "className": "level-2", "children": [ { "id": "n2", "name": "Machiavelli", "className": "level-3", "children": [ { "id": "n9", "name": "Edison, Thomas", "className": "level-4" } ] } ] }, { "id": "n3", "name": "Einstein", "className": "level-2", "children": [ { "id": "n10", "name": "Arf, Cahit", "className": "level-3", "children": [ { "id": "n15", "name": "Rawls, John", "className": "level-4" } ] }, { "id": "n12", "name": "Smith, Adam", "className": "level-3", "children": [ { "id": "n11", "name": "Kant, Immanuel", "className": "level-4" } ] } ] }, { "id": "n60", "name": "Turing, Alan", "className": "level-2" } ] };
const newData= _.cloneDeepWith(data, (val, key) => (
(key === 'className') ? `${val} YES` : _.noop()
));
console.log(newData);
// {
// id: 'n27',
// name: 'Thomas More',
// className: 'level-1 YES',
// ...
// }

Transformation of nested object

I am new to JavaScript and Node JS
want to transform the following nested object with student
Data:
[{
"id": 1,
"name": "A",
"children": [{
"id": 2,
"name": "B",
"children": [{
"id": 3,
"name": "C"
},
{
"id": 4,
"name": "D"
}
]
}]
}]
to
Expected:
[{
"student": {
"id": 1,
"name": "A"
},
"children": [{
"student": {
"id": 2,
"name": "B"
},
"children": [{
"student": {
"id": 3,
"name": "C"
}
},
{
"student": {
"id": 4,
"name": "D"
}
}
]
}]
}]

I guess you are seeking a solution for an array with multiple student objects. So you can use the map method to modify them.
const original = [{
"id": 1,
"name": "A",
"children": [{
"id": 2,
"name": "B",
"children": [{
"id": 3,
"name": "C"
},
{
"id": 4,
"name": "D"
}
]
}]
}]
const modified = original.map(stu => {
return {
student: {
id: stu.id,
name: stu.name,
},
children: stu.children
}
})

How to filter through children of array of objects and then return parent with updated children?

I'm trying to filter through an array of objects it's children then update the children and return the parent with updated children.
Example array of objects:
[
{
"id": 1,
"name": "group1",
"users": [
{
"id": 1,
"name": "Mike"
},
{
"id": 2,
"name": "Steve"
},
{
"id": 3,
"name": "John"
}
]
},
{
"id": 2,
"name": "group2",
"users": [
{
"id": 4,
"name": "Phill"
},
{
"id": 5,
"name": "Joe"
},
{
"id": 6,
"name": "Dominik"
}
]
}
]
I've got an input in React where someone can type in a name of an user, then i'd like to only show the users with that name while keeping the group that they're in.
For example, if the input is 'Mike' I would like the result to be:
[
{
"id": 1,
"name": "group1",
"users": [
{
"id": 1,
"name": "Mike"
}
]
},
{
"id": 2,
"name": "group2",
"users": []
}
]

You can use map() and filter() to do that.
let arr = [ { "id": 1, "name": "group1", "users": [ { "id": 1, "name": "Mike" }, { "id": 2, "name": "Steve" }, { "id": 3, "name": "John" } ] }, { "id": 2, "name": "group2", "users": [ { "id": 4, "name": "Phill" }, { "id": 5, "name": "Joe" }, { "id": 6, "name": "Dominik" } ] } ];
function filterUsers(arr, name) {
return arr.map(obj => {
return {
...obj,
"users": obj.users.filter(user => user.name === name)
};
});
}
console.log(filterUsers(arr, "Mike"));

Flattening deeply nested array of objects

I got following data structure, which is an array of accounts objects, where some accounts are being parents to its children accounts, which in turn can be parents to other accounts etc.:
[{
"id": "acc.1260446672222.11",
"type": "EXPENSES_FOLDER",
"name": "Expense Group",
"balance": 3418.11,
"children": [{
"id": "acc.1260446672238.27",
"type": "EXPENSE",
"name": "Advertising, Promotion and Entertainment Account",
"balance": 0,
"children": []
}, {
"id": "acc.9a2492ba-0d82-4f4a-a1b4-14868f1e1a39",
"type": "EXPENSES_FOLDER",
"name": "Premises Costs",
"balance": 0,
"children": [{
"id": "acc.287ba5b6-5536-428b-950f-d71d2af73ccc",
"type": "EXPENSE",
"name": "Use of Home - Gas",
"balance": 0,
"children": [
]
}, {
"id": "acc.7091ee15-3f02-4bd1-94e5-5918cf986969",
"type": "EXPENSE",
"name": "Hire of Venue, Studios, Teaching Rooms",
"balance": 0,
"children": [
]
}]
}, {
"id": "acc.827ec446-edeb-4f2b-8032-d306292d2d83",
"type": "EXPENSES_FOLDER",
"name": "Administrative Expenses",
"balance": 558.61,
"children": [{
"id": "acc.0ed5fc81-7734-4452-86a9-db22a6b0f8e8",
"type": "EXPENSE",
"name": "Bank Charges",
"balance": 15,
"children": [
]
}, {
"id": "acc.e2cdb2c0-8565-4991-a35a-d4596b0ddf45",
"type": "EXPENSE",
"name": "Software & Computer Peripherals",
"balance": 417.13,
"children": [
]
}, {
"id": "acc.96d5d00e-43f4-4d3a-b97b-fdf258c65514",
"type": "EXPENSE",
"name": "Printing, photocopying etc",
"balance": 55.93,
"children": [
]
}, {
"id": "acc.494dd64a-4fb3-42b8-be3e-8f3b59a2ef59",
"type": "EXPENSE",
"name": "Artists Administration Service",
"balance": 0,
"children": [
]
}, {
"id": "acc.1260446672238.35",
"type": "EXPENSE",
"name": "Stationery",
"balance": 0,
"children": [
]
}, {
"id": "acc.96d89d0d-5465-488b-b37f-d41ca114c5e6",
"type": "EXPENSE",
"name": "Mobile Telephone",
"balance": 41.19,
"children": [
]
}, {
"id": "acc.1260446672238.33",
"type": "EXPENSE",
"name": "Home Telephone",
"balance": 0,
"children": [
]
}, {
"id": "acc.1260446672238.38",
"type": "EXPENSE",
"name": "Postage/delivery",
"balance": 29.36,
"children": [
]
}]
}, {
"id": "acc.b9c9bbc7-43df-472e-9ac8-c7c76f08f49a",
"type": "EXPENSES_FOLDER",
"name": "Instruments, Equipment Maintenance etc",
"balance": 1002.48,
"children": [{
"id": "acc.1260446672238.32",
"type": "OTHER_EXPENSES",
"name": "Instrument Insurance",
"balance": 157.48,
"children": [
]
}, {
"id": "acc.2a1cca15-2868-4770-a3e7-d43a6268c6a1",
"type": "EXPENSE",
"name": "Instrument Repairs & Maintenance",
"balance": 845,
"children": [
]
}, {
"id": "acc.a908aee0-84fb-450a-916b-4cec25265aef",
"type": "EXPENSE",
"name": "Accessories & Replacement Parts",
"balance": 0,
"children": [
]
}]
}, {
"id": "acc.a42cdd86-0d9e-4f3f-af0d-7c4525374731",
"type": "EXPENSES_FOLDER",
"name": "Motor Vehicle",
"balance": 0,
"children": [{
"id": "acc.cb325e7e-0ce4-4c78-9cb4-20659df733a6",
"type": "EXPENSE",
"name": "Fuel and Oil",
"balance": 0,
"children": [
]
}]
}, {
"id": "acc.4bdd9e26-ce64-4e7f-b46a-82ec9de06ded",
"type": "EXPENSES_FOLDER",
"name": "Other Travel",
"balance": 132.1,
"children": [{
"id": "acc.77dd2142-f2de-4a2c-9247-061d0661bc0a",
"type": "EXPENSE",
"name": "Taxis",
"balance": 24.5,
"children": [
]
}, {
"id": "acc.2b54abdd-7ef5-43cd-bdb9-c8c981b59ff2",
"type": "EXPENSE",
"name": "Public Transport",
"balance": 107.6,
"children": [
]
}]
}, {
"id": "acc.e4695b70-31fa-4e23-afd0-97335dcd5b9e",
"type": "EXPENSE",
"name": "Subsitence",
"balance": 0,
"children": [
]
}, {
"id": "acc.02d222bf-4dff-4308-afe9-69b93f412ada",
"type": "EXPENSE",
"name": "Hotel and Accomodation",
"balance": 0,
"children": [
]
}, {
"id": "acc.d61cd5b4-2c80-4ab8-93d0-9d5726bd253b",
"type": "EXPENSES_FOLDER",
"name": "Fees and Commission Paid",
"balance": 0,
"children": [{
"id": "acc.1262189019758.7",
"type": "EXPENSE",
"name": "Pupils exam entry fees",
"balance": 0,
"children": [
]
}, {
"id": "acc.a7d7efd3-d0da-4704-babb-079b6077f3fe",
"type": "EXPENSE",
"name": "Audition, competition entry fees",
"balance": 0,
"children": [
]
}, {
"id": "acc.3b91ee4e-40a8-46d8-aa05-3afa5974b3ef",
"type": "EXPENSE",
"name": "Deputies, Other Musicians",
"balance": 0,
"children": [
]
}]
}, {
"id": "acc.250d6872-6023-4599-a0b6-b7159eebbfa1",
"type": "EXPENSES_FOLDER",
"name": "Other Professional Expenses",
"balance": 1739.42,
"children": [{
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"type": "EXPENSE",
"name": "Promotion & Publicity",
"balance": 138.6,
"children": [
]
}, {
"id": "acc.69ca2005-d7a0-448b-b70c-dafb128a48ae",
"type": "EXPENSE",
"name": "Other Expenses",
"balance": 364.5,
"children": [
]
}, {
"id": "acc.dcd999d2-4e18-41be-b9cc-218d4034b88e",
"type": "EXPENSE",
"name": "Office Equipment, Furniture",
"balance": 0,
"children": [
]
}, {
"id": "acc.e0460706-d5c9-4c40-9d1e-0d2058864b92",
"type": "EXPENSE",
"name": "CDs, Dowloads etc",
"balance": 67.57,
"children": [
]
}, {
"id": "acc.1866df79-9e44-459a-a978-727904987469",
"type": "EXPENSE",
"name": "Professional Books, Magazines",
"balance": 104.01,
"children": [
]
}, {
"id": "acc.24c1651d-e7ae-48bc-a32d-311427e0fcea",
"type": "EXPENSE",
"name": "Professional Associations",
"balance": 272.17,
"children": [
]
}, {
"id": "acc.289ab0ac-b9d3-435e-ac82-9da9702b7d4b",
"type": "EXPENSE",
"name": "Tuition",
"balance": 470,
"children": [
]
}, {
"id": "acc.f24cf99b-6291-4b9f-821e-425f4909d4e1",
"type": "EXPENSE",
"name": "Scores, Manuscript Paper etc",
"balance": 215.32,
"children": [
]
}, {
"id": "acc.1af95953-56f0-455e-9d0a-7c4e0477cf0d",
"type": "EXPENSE",
"name": "Performance Clothing",
"balance": 0,
"children": [
]
}, {
"id": "acc.c0585577-535a-4ae2-a02b-e5b249f67c67",
"type": "EXPENSE",
"name": "Concerts, Shows etc",
"balance": 107.25,
"children": [
]
}]
}, {
"id": "acc.1260446672222.24",
"type": "ADMIN",
"name": "Administrative Expenses",
"balance": 0,
"children": [
]
}, {
"id": "acc.1260446672238.26",
"type": "TRAVEL",
"name": "Travel and Subsistence Account",
"balance": -14.5,
"children": [
]
}, {
"id": "acc.1260446672238.28",
"type": "LEGAL",
"name": "Legal and Professional Costs Account",
"balance": 0,
"children": [
]
}, {
"id": "acc.1260446672238.36",
"type": "OTHER_EXPENSES",
"name": "Rent/Rates",
"balance": 0,
"children": [
]
}, {
"id": "acc.1262191376548.37",
"type": "EXPENSE",
"name": "Research",
"balance": 0,
"children": [
]
}, {
"id": "acc.1262191388329.38",
"type": "EXPENSE",
"name": "Professional Development",
"balance": 0,
"children": [
]
}, {
"id": "acc.1262192291558.52",
"type": "EXPENSE",
"name": "Professional Presentation",
"balance": 0,
"children": [
]
}, {
"id": "acc.1262193596634.72",
"type": "EXPENSE",
"name": "Subscriptions",
"balance": 0,
"children": [
]
}, {
"id": "acc.1262265941130.16",
"type": "EXPENSE",
"name": "Piano accompaniment",
"balance": 0,
"children": [
]
}, {
"id": "acc.1267370824329.1",
"type": "EXPENSE",
"name": "Cost of Sales",
"balance": 0,
"children": [
]
}]
}]
What I need is to flatten this array to have a flat list of accounts. What's the way to proceed with that in Vanilla JavaScript. (I also got access to lodash methods in my project).

Just iterate over and if a children is found get the array from the children concatinated.
function flat(array) {
var result = [];
array.forEach(function (a) {
result.push(a);
if (Array.isArray(a.children)) {
result = result.concat(flat(a.children));
}
});
return result;
}
var data = [{ id: "acc.1260446672222.11", type: "EXPENSES_FOLDER", name: "Expense Group", balance: 3418.11, children: [{ id: "acc.1260446672238.27", type: "EXPENSE", name: "Advertising, Promotion and Entertainment Account", balance: 0, children: [] }, { id: "acc.9a2492ba-0d82-4f4a-a1b4-14868f1e1a39", type: "EXPENSES_FOLDER", name: "Premises Costs", balance: 0, children: [{ id: "acc.287ba5b6-5536-428b-950f-d71d2af73ccc", type: "EXPENSE", name: "Use of Home - Gas", balance: 0, children: [] }, { id: "acc.7091ee15-3f02-4bd1-94e5-5918cf986969", type: "EXPENSE", name: "Hire of Venue, Studios, Teaching Rooms", balance: 0, children: [] }] }, { id: "acc.827ec446-edeb-4f2b-8032-d306292d2d83", type: "EXPENSES_FOLDER", name: "Administrative Expenses", balance: 558.61, children: [{ id: "acc.0ed5fc81-7734-4452-86a9-db22a6b0f8e8", type: "EXPENSE", name: "Bank Charges", balance: 15, children: [] }, { id: "acc.e2cdb2c0-8565-4991-a35a-d4596b0ddf45", type: "EXPENSE", name: "Software & Computer Peripherals", balance: 417.13, children: [] }, { id: "acc.96d5d00e-43f4-4d3a-b97b-fdf258c65514", type: "EXPENSE", name: "Printing, photocopying etc", balance: 55.93, children: [] }, { id: "acc.494dd64a-4fb3-42b8-be3e-8f3b59a2ef59", type: "EXPENSE", name: "Artists Administration Service", balance: 0, children: [] }, { id: "acc.1260446672238.35", type: "EXPENSE", name: "Stationery", balance: 0, children: [] }, { id: "acc.96d89d0d-5465-488b-b37f-d41ca114c5e6", type: "EXPENSE", name: "Mobile Telephone", balance: 41.19, children: [] }, { id: "acc.1260446672238.33", type: "EXPENSE", name: "Home Telephone", balance: 0, children: [] }, { id: "acc.1260446672238.38", type: "EXPENSE", name: "Postage/delivery", balance: 29.36, children: [] }] }, { id: "acc.b9c9bbc7-43df-472e-9ac8-c7c76f08f49a", type: "EXPENSES_FOLDER", name: "Instruments, Equipment Maintenance etc", balance: 1002.48, children: [{ id: "acc.1260446672238.32", type: "OTHER_EXPENSES", name: "Instrument Insurance", balance: 157.48, children: [] }, { id: "acc.2a1cca15-2868-4770-a3e7-d43a6268c6a1", type: "EXPENSE", name: "Instrument Repairs & Maintenance", balance: 845, children: [] }, { id: "acc.a908aee0-84fb-450a-916b-4cec25265aef", type: "EXPENSE", name: "Accessories & Replacement Parts", balance: 0, children: [] }] }, { id: "acc.a42cdd86-0d9e-4f3f-af0d-7c4525374731", type: "EXPENSES_FOLDER", name: "Motor Vehicle", balance: 0, children: [{ id: "acc.cb325e7e-0ce4-4c78-9cb4-20659df733a6", type: "EXPENSE", name: "Fuel and Oil", balance: 0, children: [] }] }, { id: "acc.4bdd9e26-ce64-4e7f-b46a-82ec9de06ded", type: "EXPENSES_FOLDER", name: "Other Travel", balance: 132.1, children: [{ id: "acc.77dd2142-f2de-4a2c-9247-061d0661bc0a", type: "EXPENSE", name: "Taxis", balance: 24.5, children: [] }, { id: "acc.2b54abdd-7ef5-43cd-bdb9-c8c981b59ff2", type: "EXPENSE", name: "Public Transport", balance: 107.6, children: [] }] }, { id: "acc.e4695b70-31fa-4e23-afd0-97335dcd5b9e", type: "EXPENSE", name: "Subsitence", balance: 0, children: [] }, { id: "acc.02d222bf-4dff-4308-afe9-69b93f412ada", type: "EXPENSE", name: "Hotel and Accomodation", balance: 0, children: [] }, { id: "acc.d61cd5b4-2c80-4ab8-93d0-9d5726bd253b", type: "EXPENSES_FOLDER", name: "Fees and Commission Paid", balance: 0, children: [{ id: "acc.1262189019758.7", type: "EXPENSE", name: "Pupils exam entry fees", balance: 0, children: [] }, { id: "acc.a7d7efd3-d0da-4704-babb-079b6077f3fe", type: "EXPENSE", name: "Audition, competition entry fees", balance: 0, children: [] }, { id: "acc.3b91ee4e-40a8-46d8-aa05-3afa5974b3ef", type: "EXPENSE", name: "Deputies, Other Musicians", balance: 0, children: [] }] }, { id: "acc.250d6872-6023-4599-a0b6-b7159eebbfa1", type: "EXPENSES_FOLDER", name: "Other Professional Expenses", balance: 1739.42, children: [{ id: "acc.b7315228-f85a-4ffb-9199-d1128a409e5f", type: "EXPENSE", name: "Promotion & Publicity", balance: 138.6, children: [] }, { id: "acc.69ca2005-d7a0-448b-b70c-dafb128a48ae", type: "EXPENSE", name: "Other Expenses", balance: 364.5, children: [] }, { id: "acc.dcd999d2-4e18-41be-b9cc-218d4034b88e", type: "EXPENSE", name: "Office Equipment, Furniture", balance: 0, children: [] }, { id: "acc.e0460706-d5c9-4c40-9d1e-0d2058864b92", type: "EXPENSE", name: "CDs, Dowloads etc", balance: 67.57, children: [] }, { id: "acc.1866df79-9e44-459a-a978-727904987469", type: "EXPENSE", name: "Professional Books, Magazines", balance: 104.01, children: [] }, { id: "acc.24c1651d-e7ae-48bc-a32d-311427e0fcea", type: "EXPENSE", name: "Professional Associations", balance: 272.17, children: [] }, { id: "acc.289ab0ac-b9d3-435e-ac82-9da9702b7d4b", type: "EXPENSE", name: "Tuition", balance: 470, children: [] }, { id: "acc.f24cf99b-6291-4b9f-821e-425f4909d4e1", type: "EXPENSE", name: "Scores, Manuscript Paper etc", balance: 215.32, children: [] }, { id: "acc.1af95953-56f0-455e-9d0a-7c4e0477cf0d", type: "EXPENSE", name: "Performance Clothing", balance: 0, children: [] }, { id: "acc.c0585577-535a-4ae2-a02b-e5b249f67c67", type: "EXPENSE", name: "Concerts, Shows etc", balance: 107.25, children: [] }] }, { id: "acc.1260446672222.24", type: "ADMIN", name: "Administrative Expenses", balance: 0, children: [] }, { id: "acc.1260446672238.26", type: "TRAVEL", name: "Travel and Subsistence Account", balance: -14.5, children: [] }, { id: "acc.1260446672238.28", type: "LEGAL", name: "Legal and Professional Costs Account", balance: 0, children: [] }, { id: "acc.1260446672238.36", type: "OTHER_EXPENSES", name: "Rent/Rates", balance: 0, children: [] }, { id: "acc.1262191376548.37", type: "EXPENSE", name: "Research", balance: 0, children: [] }, { id: "acc.1262191388329.38", type: "EXPENSE", name: "Professional Development", balance: 0, children: [] }, { id: "acc.1262192291558.52", type: "EXPENSE", name: "Professional Presentation", balance: 0, children: [] }, { id: "acc.1262193596634.72", type: "EXPENSE", name: "Subscriptions", balance: 0, children: [] }, { id: "acc.1262265941130.16", type: "EXPENSE", name: "Piano accompaniment", balance: 0, children: [] }, { id: "acc.1267370824329.1", type: "EXPENSE", name: "Cost of Sales", balance: 0, children: [] }] }],
result = flat(data);
document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');

try to understand this version, with it's benefits and implications
function flatten(into, node){
if(node == null) return into;
if(Array.isArray(node)) return node.reduce(flatten, into);
into.push(node);
return flatten(into, node.children);
}
var out = flatten([], yourArray);
the argument order might be confusing at first, unless you are used to reduced, or the concept of options first, data last, wich is very handy when it comes to FP and currying or partial application.

You could make a recursive function that looks through each account, and if it has children calls itself on the children, the function should return a flattened array of accounts.
This example is a bit more complicated than it has to be because I am assuming that order matters and that the parent should be before the children.
function flattenAccounts(accounts){
var a = [];
for(var i=0;i<accounts.length;i++){
var o = accounts[i];
if(o.children){
var c = flattenAccounts(o.children);
if(c){
a = a.concat(c);
}
}
a.push(o)
}
return a;
}
This is a simpler example but the children would end up before the parent.
function flattenAccounts(accounts){
var a = [];
for(var i=0;i<accounts.length;i++){
if(accounts[i].children){
a = a.concat(flattenAccounts(accounts[i].children) )
}
a.push(accounts[i])
}
return a;
}

You can loop through the array entries, check if it's an array with isArray() and recursively flatten the entries of the array as below:
function deepFlattenArray(arr) {
const finalArray = [];
// Loop through the array contents
for (let i = 0; i < arr.length; i++) {
if (Array.isArray(arr[i])) {
// Recursively flatten entries that are arrays and push into the finalArray
finalArray.push(...deepFlattenArray(arr[i]));
} else {
// Push entries that are not arrays
finalArray.push(arr[i]);
}
}
return finalArray;
}

I'd like to point out that all answers work by copying the children to the root, but leaving the original children in place, and hence creating duplicates - not a flat array.
Depending on how the data is used, this might lead to issues. I would certainly not want to be caught by my team leaving a messy array behind.
I couldn't find a solution to remove the children within the recursive function, so I added a second "cleanup" function.
Based on the accepted answer by Nina Scholz:
function flattenArr(arr) {
var dirtyArr = function(arr) {
let result = [];
arr.forEach((arrItem) => {
result.push(arrItem);
if (Array.isArray(arrItem.children)) {
result = result.concat(dirtyArr(arrItem.children));
}
});
return result;
};
var cleanArr = function(arr) {
arr.forEach((arrItem) => {
if (arrItem.hasOwnProperty('children')) {
delete arrItem.children;
}
});
return arr;
};
return cleanArr(dirtyArr(arr));
}

You can also use javascript recursive map function and get the children nodes of the nested array, like this:
const dataTree = [//array above];
const getMembers = (members) => {
let children = [];
const flattenMembers = members.map(m => {
if (m.children && m.children.length) {
children = [...children, ...m.children];
}
return m;
});
return flattenMembers.concat(children.length ? getMembers(children) : children);
};
getMembers(dataTree);
Source Here

Yet another approach.. It's simple but it works.
function flattenChildren(arr: any): any {
return arr.flatMap(({ children, ...o }: { children: any; o: any }) => [
o,
...flattenChildren(children),
])
}

Convert tree structure to hierarchical array

I have puzzling with this problem for hours. I am using Angular and angular-ui-tree to create an editable tree with unknown number of leaves.
I need to flatten and convert the tree into a hierarchical array in order to pass it to MongoDb. I am also using Underscore.js as a utility
var tree = [{
"_id": 1,
"title": "node1",
"nodes": [{
"_id": 11,
"title": "node1.1",
"nodes": [{
"_id": 111,
"title": "node1.1.1",
"children": [{
"_id": 1111,
"title": "node1.1.1.1",
"children": []
}]
}]
}, {
"_id": 12,
"title": "node1.2",
"children": []
}]
}, {
"_id": 2,
"title": "node2",
"children": [{
"id": 21,
"title": "node2.1",
"children": []
}, {
"_id": 22,
"title": "node2.2",
"children": []
}]
}, {
"_id": 3,
"title": "node3",
"children": [{
"id": 31,
"title": "node3.1",
"children": []
}]
}, {
"_id": 4,
"title": "node4",
"children": [{
"_id": 41,
"title": "node4.1",
"children": []
}]
}]
//desired output
//parentId is null for top leaf nodes, path is String made by the parents' ids
[
{ "_id": 1, "title": "node1", "parentId": null, "path" : ""},
{ "_id": 11, "title": "node1.1", "parentId": 1, "path" : ",1"},
{ "_id": 111, "title": "node1.1.1", "parentId": 11, "path" : ",1,11"},
{ "_id": 1111, "title": "node1.1.1.1", "parentId": 111, "path" : ",1,11,111"},
{ "_id": 12, "title": "node1.1", "parentId": 1, "path" : ",1"},
{ "_id": 2, "title": "node2", "parentId": null, "path" : ""},
{ "_id": 21, "title": "node2.1", "parentId": 2, "path" : ",2"},
{ "_id": 3, "title": "node3", "parentId": null, "path" : ""},
{ "_id": 31, "title": "node3.1", "parentId": 3, "path" : ",3"},
{ "_id": 4, "title": "node4", "parentId": null, "path" : ""},
{ "_id": 41, "title": "node4.1", "parentId": 4, "path" : ",4"},
]

I'd use recursion here to "walk" down the tree. Note that your input tree sometimes uses "children" and sometimes uses "nodes" to denote its array of children; I have changed it to "children" throughout.
var wholeTree = [{
"_id": 1,
"title": "node1",
"children": [{
"_id": 11,
"title": "node1.1",
"children": [{
"_id": 111,
"title": "node1.1.1",
"children": [{
"_id": 1111,
"title": "node1.1.1.1",
"children": []
}]
}]
}, {
"_id": 12,
"title": "node1.2",
"children": []
}]
}, {
"_id": 2,
"title": "node2",
"children": [{
"id": 21,
"title": "node2.1",
"children": []
}, {
"_id": 22,
"title": "node2.2",
"children": []
}]
}, {
"_id": 3,
"title": "node3",
"children": [{
"id": 31,
"title": "node3.1",
"children": []
}]
}, {
"_id": 4,
"title": "node4",
"children": [{
"_id": 41,
"title": "node4.1",
"children": []
}]
}];
var flattened = flattenTreeToNodes( wholeTree, null, "" );
$("#output").text( JSON.stringify(flattened) );
function flattenTreeToNodes( tree, parentId, basePath ) {
console.log( parentId, basePath );
function createFlattenedNode( treeNode ) {
var path = parentId?basePath + "," + parentId:"";
return {
"_id": treeNode._id,
title: treeNode.title,
parentId: parentId,
path: path
}
}
var nodes = [];
for(var i=0; i<tree.length; i++) {
var treeNode = tree[i];
var flattenedNode = createFlattenedNode(treeNode);
nodes.push ( flattenedNode );
var flattenedChildren = flattenTreeToNodes( treeNode.children, treeNode._id, flattenedNode.path );
nodes = nodes.concat( flattenedChildren );
}
return nodes;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<pre id='output'>
</pre>

A Simple recursive function will do the job :
var out = [
];
var generate = function (collection, parent) {
for (var i = 0; i < collection.length; i++) {
var obj = {
'_id': collection[i]['_id'],
'title': collection[i]['title'],
'parentId': parent ? parent['_id'] : null,
'path': parent ? ',' + parent['_id'] : ''
};
out.push(obj);
if (collection[i].nodes) {
generate(collection[i].nodes, collection[i]);
} else {
generate(collection[i].children, collection[i]);
}
}
};
See example below:
var tree = [
{
'_id': 1,
'title': 'node1',
'nodes': [
{
'_id': 11,
'title': 'node1.1',
'nodes': [
{
'_id': 111,
'title': 'node1.1.1',
'children': [
{
'_id': 1111,
'title': 'node1.1.1.1',
'children': [
]
}
]
}
]
},
{
'_id': 12,
'title': 'node1.2',
'children': [
]
}
]
},
{
'_id': 2,
'title': 'node2',
'children': [
{
'id': 21,
'title': 'node2.1',
'children': [
]
},
{
'_id': 22,
'title': 'node2.2',
'children': [
]
}
]
},
{
'_id': 3,
'title': 'node3',
'children': [
{
'id': 31,
'title': 'node3.1',
'children': [
]
}
]
},
{
'_id': 4,
'title': 'node4',
'children': [
{
'_id': 41,
'title': 'node4.1',
'children': [
]
}
]
}
];
var out = [
];
var generate = function (collection, parent) {
for (var i = 0; i < collection.length; i++) {
var obj = {
'_id': collection[i]['_id'],
'title': collection[i]['title'],
'parentId': parent ? parent['_id'] : null,
'path': parent ? ',' + parent['_id'] : ''
};
out.push(obj);
if (collection[i].nodes) {
generate(collection[i].nodes, collection[i]);
} else {
generate(collection[i].children, collection[i]);
}
}
};
generate(tree, null);
console.log(JSON.stringify(out,null,4));
//prints
[
{
"_id": 1,
"title": "node1",
"parentId": null,
"path": ""
},
{
"_id": 11,
"title": "node1.1",
"parentId": 1,
"path": ",1"
},
{
"_id": 111,
"title": "node1.1.1",
"parentId": 11,
"path": ",11"
},
{
"_id": 1111,
"title": "node1.1.1.1",
"parentId": 111,
"path": ",111"
},
{
"_id": 12,
"title": "node1.2",
"parentId": 1,
"path": ",1"
},
{
"_id": 2,
"title": "node2",
"parentId": null,
"path": ""
},
{
"title": "node2.1",
"parentId": 2,
"path": ",2"
},
{
"_id": 22,
"title": "node2.2",
"parentId": 2,
"path": ",2"
},
{
"_id": 3,
"title": "node3",
"parentId": null,
"path": ""
},
{
"title": "node3.1",
"parentId": 3,
"path": ",3"
},
{
"_id": 4,
"title": "node4",
"parentId": null,
"path": ""
},
{
"_id": 41,
"title": "node4.1",
"parentId": 4,
"path": ",4"
}
]

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