I am trying to return all objects that have a specific 'id' in the nested array. In the sample data, I'd like to return all person objects with hobbies id of 2 (hiking).
The other question addresses the problem of finding all values in an array based on an object value.
This question differs from the previous because I need to return all objects based on a value inside of a nested array.
[
{
"id":111222,
"name":"Faye",
"age":27,
"hobbies":[
{
"id":2,
"name":"hiking"
},
{
"id":3,
"name":"eating"
}
]
},
{
"id":223456789001,
"name":"Bobby",
"age":35,
"hobbies":[
{
"id":2,
"name":"hiking"
},
{
"id":4,
"name":"online gaming"
}
]
}
]
function hasHobby(person, hobbyId) {
return person.hobbies.some(function(hobby) {
return hobby.id === hobbyId;
});
}
function filterByHobby(people, hobbyId) {
return people.filter(function(person) {
return hasHobby(person, hobbyId);
});
}
If you wanna use the new cool ES6 syntax:
function filterByHobby(people, hobbyId) {
return people.filter(
person => person.hobbies.some(
hobby => hobby.id === hobbyId
)
);
}
var arr = [
{
"id":111222,
"name":"Faye",
"age":27,
"hobbies":[
{
"id":2,
"name":"hiking"
},
{
"id":3,
"name":"eating"
}
]
},
{
"id":223456789001,
"name":"Bobby",
"age":35,
"hobbies":[
{
"id":2,
"name":"hiking"
},
{
"id":4,
"name":"online gaming"
}
]
}
];
arr.filter(function(obj) {
var hobbies = obj.hobbies;
var x = hobbies.filter(function(hob) {
if (hob.id == "2") return true;
});
if (x.length > 0) return true;
});
Try this, I think its solve your proble:
var arr = [{
"id": 111222,
"name": "Faye",
"age": 27,
"hobbies": [{
"id": 2,
"name": "hiking"
}, {
"id": 3,
"name": "eating"
}]
}, {
"id": 223456789001,
"name": "Bobby",
"age": 35,
"hobbies": [{
"id": 2,
"name": "hiking"
}, {
"id": 4,
"name": "online gaming"
}]
}];
var x = arr.filter(function(el) {
var rnel = el.hobbies.filter(function(nel) {
return nel.id == 2;
});
return rnel.length > 0 ? true :false;
});
alert(x.length);
Related
Json:( How to iterate this array of arrays using map function.. I have tried this.. In this.materialList => array i am getting only 1 st array of values 2nd and 3rd array values are getting undefined.. so i am not able to display in html.. )
subrecipes:[
subrecipematerials: [
"id": 1
"material_id": {
"id":1,
"title":"cookies"
}
],
[
"id": 2
material_id: {
"id":2,
"title":"cake"
}
]
subrecipeformulations: [
"id": 1,
"formula_id": {
"id":1,
"title":formula1
}
]
]
subrecipes:[
subrecipematerials: [
"id": 1
material_id: {
"id":1,
"title":"cookies"
}
],
[
"id": 2
material_id: {
"id":2,
"title":"cake"
}
]
subrecipeformulations: [
"id": 1,
"formula_id": {
"id":1,
"title":formula1
}
]
]
component.ts(I have tried this.. In this.materialList => array i am getting only 1 st array of values 2nd and 3rd array values are getting undefined.. so i am not able to display in html.. )
let subrecipeMaterials = this.data.subRecipes.map((item, index) => {
item = item.subrecipeMaterials[index]
return item
})
let tempMatList1 = this.group_By_Data(subrecipeMaterials, "sub_recipe_id")
let matSubrecipies = Object.keys(tempMatList1).map(data => tempMatList1[data])
this.filterMaterials(matSubrecipies)
this.subrecipies = matSubrecipies.map((data, index) => {
return {
matList: this.materialList[index],
formList: this.otherFormulationList[index],
subRec: (index + 1)
}
})
group_By_Data(arr, key) {
return arr.reduce(function (rv, x) {
(rv[x[key]] = rv[x[key]] || []).push(x);
return rv;
}, {});
}
filterMaterials(matSubrecipies) {
this.materialList = matSubrecipies.map(sub => {
return sub.filter(mat => {
let checkmat_id = mat.material_id
if (!!checkmat_id) }
return mat.material_id
}
})
})
}
getMaterialListArray(i) {// this function used to display this array through html.. right now only i am getting 1st array..
return this.materialList[i]
}
Your data is not correct. I think it should be in the form:
{subrecipes:[{
subrecipematerials: [{
"id": 1,
"material_id": {
"id":1,
"title":"cookies"
},
},
{
"id": 2,
material_id: {
"id":2,
"title":"cake"
}
}],
subrecipeformulations: [{
"id": 1,
"formula_id": {
"id":1,
"title":"formula1"
}
}]
},
{
subrecipematerials: [{
"id": 1,
material_id: {
"id":1,
"title":"cookies"
}
},
{
"id": 2,
material_id: {
"id":2,
"title":"cake"
}
} ] ,
subrecipeformulations: [{
"id": 1,
"formula_id": {
"id":1,
"title":"formula1"
}
}]
}]
};
Also, the code item = item.subrecipeMaterials[index] should be item = item.subrecipematerials[index] (difference is M and m as it is case sensitive).
let data = {
"rec": [{
"id": "25837",
"contentId": "25838"
},
{
"id": "25839",
"contentId": "25838"
},
{
"id": "25838"
},
{
"id": "25636",
"contentId": "25837"
}, {
"id": "25640",
"contentId": "25839"
}
]
};
I have a javascript object which I have to manipulate to below format.
{
"childern": [{
"id": "25838",
"childern": [{
"id": "25837",
"contentId": "25838",
"childern": [{
"id": "25636",
"contentId": "25837"
}]
},
{
"id": "25839",
"contentId": "25838",
"childern": [{
"id": "25640",
"contentId": "25839"
}]
}
]
}]
}
If any object dont have contentId it should be at parent level. then all the objects having contentId same as parent id should be at its child level and so on.
I have created a fiddle here but logic is not completed. Any idea or reference to achieve this.
You could create recursive function with reduce method to get the desired result.
let data = {"rec":[{"id":"25837","contentId":"25838"},{"id":"25839","contentId":"25838"},{"id":"25838"},{"id":"25636","contentId":"25837"},{"id":"25640","contentId":"25839"}]}
function nest(data, pid) {
return data.reduce((r, e) => {
if (pid == e.contentId) {
const obj = { ...e }
const children = nest(data, e.id);
if (children.length) obj.children = children
r.push(obj)
}
return r;
}, [])
}
const result = nest(data.rec);
console.log(result[0])
I'm trying to filter an nested array of objects but it's not working as expected....
Here is my json:
[
{
"seasson_number": "1",
"episodes": [
{
"number": 1,
"video_url": "http://test.com",
"name": "Testing"
},
{
"number": 2,
"video_url": "http://test.com",
"name": "Testing"
}
]
},
{
"seasson_number": "2",
"episodes": [
{
"number": 1,
"video_url": "http://test.com",
"name": "Testing"
},
{
"number": 2,
"video_url": "http://test.com",
"name": "Testing"
}
]
}
]
And this is my function to filter by the seasson_number and get the episode name:
const episodios = this.state.seassons
.filter(seasson => {
return seasson.seasson_number === "2"; // sample number
})
.map(seasson => {
seasson.episodes.map(episode =>{
return (
<h2>{episode.name}</h2>
)
})
});
In your first map function, you should add a return statement:
map(seasson => {
return seasson.episodes.map(episode =>{
return (
<h2>{episode.name}</h2>
)
})
});
i have this array of objects : getCategory (variable)
[
{
"id": "20584",
"name": "Produits de coiffure",
"subCategory": [
{
"id": "20590",
"name": "Coloration cheveux",
"subCategory": [
{
"id": "20591",
"name": "Avec ammoniaque"
},
{
"id": "20595",
"name": "Sans ammoniaque"
},
{
"id": "20596",
"name": "Soin cheveux colorés"
},
{
"id": "20597",
"name": "Protection"
},
{
"id": "20598",
"name": "Nuancier de couleurs"
}
]
},
{
"id": "20593",
"name": "Soins cheveux",
"subCategory": [
{
"id": "20594",
"name": "Shampooing"
},
{
"id": "20599",
"name": "Après-shampooing"
},
{
"id": "20600",
"name": "Masques"
},
and i tried everything i could search in stackoverflow ..
lets say on this array i want to get recursively and object with the specified id .. like 20596 and it should return
{
"id": "20596",
"name": "Soin cheveux colorés"
}
The logic way i am doing is like this :
var getSubcategory = getCategory.filter(function f(obj){
if ('subCategory' in obj) {
return obj.id == '20596' || obj.subCategory.filter(f);
}
else {
return obj.id == '20596';
}
});
dont know what else to do .
Thanks
PS : I dont use it in browser so i cannot use any library . Just serverside with no other library . find dont work so i can only use filter
You need to return the found object.
function find(array, id) {
var result;
array.some(function (object) {
if (object.id === id) {
return result = object;
}
if (object.subCategory) {
return result = find(object.subCategory, id);
}
});
return result;
}
var data = [{ id: "20584", name: "Produits de coiffure", subCategory: [{ id: "20590", name: "Coloration cheveux", subCategory: [{ id: "20591", name: "Avec ammoniaque" }, { id: "20595", name: "Sans ammoniaque" }, { id: "20596", name: "Soin cheveux colorés" }, { id: "20597", name: "Protection" }, { id: "20598", name: "Nuancier de couleurs" }] }, { id: "20593", name: "Soins cheveux", subCategory: [{ id: "20594", name: "Shampooing" }, { id: "20599", name: "Après-shampooing" }, { id: "20600", name: "Masques" }] }] }];
console.log(find(data, '20596'));
console.log(find(data, ''));
I have an array with objects, like the following.
b = {
"issues": [{
"fields": {
"status": {
"id": "200",
"name": "Backlog"
}
}
}, {
"fields": {
"status": {
"id": "202",
"name": "close"
}
}
}, {
"fields": {
"status": {
"id": "201",
"name": "close"
}
}
}]
};
I want to count how many issues have status close, and how many have backlog. I'd like to save the count in a new array as follows.
a = [
{Name: 'Backlog', count: 1},
{Name: 'close', count: 2}
];
I have tried the following.
b.issues.forEach(function(i) {
var statusName = i.fields.status.name;
if (statusName in a.Name) {
a.count = +1;
} else {
a.push({
Name: statusName,
count: 1
});
}
});
That however doesn't seem to be working. How should I implement this?
This is a perfect opportunity to use Array#reduce. That function will take a function that is applied to all elements of the array in order and can be used to accumulate a value. We can use it to accumulate an object with the various counts in it.
To make things easy, we track the counts in an object as simply {name: count, otherName: otherCount}. For every element, we check if we already have an entry for name. If not, create one with count 0. Otherwise, increment the count. After the reduce, we can map the array of keys, stored as keys of the object, to be in the format described in the question. See below.
var b = {
"issues": [{
"fields": {
"status": {
"id": "200",
"name": "Backlog"
}
}
}, {
"fields": {
"status": {
"id": "202",
"name": "close"
}
}
}, {
"fields": {
"status": {
"id": "201",
"name": "close"
}
}
}]
};
var counts = b.issues.reduce((p, c) => {
var name = c.fields.status.name;
if (!p.hasOwnProperty(name)) {
p[name] = 0;
}
p[name]++;
return p;
}, {});
console.log(counts);
var countsExtended = Object.keys(counts).map(k => {
return {name: k, count: counts[k]}; });
console.log(countsExtended);
.as-console-wrapper {
max-height: 100% !important;
}
Notes.
Array#reduce does not modify the original array.
You can easily modify the function passed to reduce to for example not distinguish between Backlog and backlog by changing
var name = c.fields.status.name;
into
var name = c.fields.status.name.toLowerCase();
for example. More advanced functionality can also easily be implemented.
Using ES6 Arrow functions you can do it with minimum syntax
var b = {
"issues": [{
"fields": {
"status": {
"id": "200",
"name": "Backlog"
}
}
}, {
"fields": {
"status": {
"id": "202",
"name": "close"
}
}
}, {
"fields": {
"status": {
"id": "201",
"name": "close"
}
}
}]
};
var countOfBackLog = b.issues.filter(x => {
return x.fields.status.name === "Backlog"
}).length
var countOfClose = b.issues.filter(x => {
return x.fields.status.name === "close"
}).length
a =[{Name: 'Backlog', count : countOfBackLog}, {Name: 'close', count : countOfClose}]
More about arrow functions here
You can write like this. It is dynamic.
var a = {};
for(var key in b["issues"]){
if(!a.hasOwnProperty(b["issues"][key].fields.status.name)){
a[b["issues"][key].fields.status.name] = 1;
}else{
a[b["issues"][key].fields.status.name] = a[b["issues"][key].fields.status.name]+1;
}
}
var c = [];
for(var key1 in a){
c.push({
name : key1,
count : a[key1]
});
}
Something like this should do the trick. Simply iterate over your data, keep 2 counters with the number of each type of issue, and create the data format you want in the end. Try it live on jsfiddle.
var b = {
"issues": [{
"fields": {
"status": {
"id": "200",
"name": "Backlog"
}
}
}, {
"fields": {
"status": {
"id": "202",
"name": "close"
}
}
}, {
"fields": {
"status": {
"id": "201",
"name": "close"
}
}
}]
};
var data = [];
for(var issue of b.issues){
var entryFound = false;
var tempObj = {
name: issue.fields.status.name,
count: 1
};
for(var item of data){
if(item.name === tempObj.name){
item.count++;
entryFound = true;
break;
}
}
if(!entryFound){
data.push(tempObj);
}
}
console.log(data);