I'm trying to dynamically create a JS object which has an array inside such as this one:
//other values omitted for clarity
"items": [
{
"name": "T-Shirt",
"unit_amount": {
"currency_code": "USD",
"value": "90.00"
},
"quantity": "1",
"category": "PHYSICAL_GOODS"
},
{
"name": "Shoes",
"unit_amount": {
"currency_code": "USD",
"value": "45.00"
},
"quantity": "2",
"category": "PHYSICAL_GOODS"
}
],
I am able to create a single value with this code:
var product = {};
product.name = "T-Shirt";
product.quantity = "1";
product.category = "PHYSICAL_GOODS";
var subproduct = {};
subproduct.currency_code = "USD";
subproduct.value = "90.00";
product.unit_amount = subproduct;
var jsonString= JSON.stringify(product);
Which creates:
{
"name": "T-Shirt",
"unit_amount": {
"currency_code": "USD",
"value": "90.00"
},
"quantity": "1",
"category": "PHYSICAL_GOODS"
}
How can I add up the created values inside the array? I have an onclick event for providing the values for any given "item" in the example. For clarity, I do not know beforehand how many "items" the array will have.
To add the object to an array you should use the array method .push().
You could do it in the following way:
// Object which has a property `items`, where we will store product objects
var main = {
items: []
};
// Create the full product object
var product = {
name: "T-Shirt";
quantity: "1";
category: "PHYSICAL_GOODS";
unit_amount: {
currency_code = "USD";
value = "90.00";
}
};
// Push the new object to the `items` array
main.items.push(product);
You are on the right path, just iterate your code and put it in an array :
var productList = [];
for (var i = 0 ; i < 2; i++) {
// your code
var product = {};
product.name = "T-Shirt";
product.quantity = "1";
product.category = "PHYSICAL_GOODS";
var subproduct = {};
subproduct.currency_code = "USD";
subproduct.value = "90.00";
product.unit_amount = subproduct;
productList.push(product);
}
var answer = JSON.stringify(productList);
console.log(answer);
Related
I have an array of objects (I think!) and I need to extract the property name (for example "nickname") from a given object.
With
var VarObjAndValue = newArr[0];
I get the individual arrays (for example Object { nickname: “jhonny” }).
How can I now extract the property name "nickname" from the object above?
Listing the keys with
var listPropertyNames = Object.keys(newArr);
only provides sequential numbers from 0 to 6 rather than the desired keys names..
var StrToInclude = ["nickname", "name", "surname", "sex", "dob", "email", "phone"];
var newArr=[]; //Key name + its value
for (var i=0; i<StrToInclude.length; i++) {
temp_obj = {};
temp_obj[StrToInclude[i]] = document.getElementById(StrToInclude[i]).value;
newArr.push(temp_obj);
}
console.log('newArr --> = ',newArr);
/**
* newArr = [
* { "nickname": “jhonny” },
* { "name": “jonathan” },
* { "surname": “ross” },
* { "sex": “male” },
* { "dob": “22/02/1984” },
* { "email": “j#yahoo.com” },
* { "phone": "123" }
* ]
*/
var VarObjAndValue = newArr[0];
console.log('VarObjAndValue --> = ',VarObjAndValue); //if i=0 ----> Object { nickname: “jhonny” }
var VarObjAndValue = newArr[1];
console.log('VarObjAndValue --> = ',VarObjAndValue); //if i=1 ----> Object { name: "jonathan" }
var listPropertyNames = Object.keys(newArr);
console.log('listPropertyNames --> = ',listPropertyNames); //Array(7) [ "0", "1", "2", "3", "4", "5", "6" ] (not useful for this...)
newArr.map(obj => Object.keys(obj)).flat()
or newArr.map(obj => Object.keys(obj)[0])
or from dave's comment
newArr.reduce((keys, o) => [...keys, ...Object.keys(o)], [])
gives you all property names as an array
Not sure if this is what you want, but you have already gotten those property names in StrToInclude
const newArr =
[
{
"nickname": "jhonny"
},
{
"name": "jonathan"
},
{
"surname": "ross"
},
{
"sex": "male"
},
{
"dob": "22/02/1984"
},
{
"email": "j#yahoo.com"
},
{
"phone": "123"
}
]
console.log(newArr.map(obj => Object.keys(obj)[0]))
You are very close to getting the right answer. Since newArr is an Array, the keys are numeric keys. All you have to do is go through each element is the Array of Objects to extract the keys. Something like this should do nicely:
for(let i = 0;i<newArr.length;i++){
console.log(Object.keys(newArr[i])); //Will go through the whole array and give you the keys of every object in it
}
You can simply do by looping over the array and using destructuring operator with the desired property name.
const arr = [
{
nickname: "abdullah"
},
{
age: 27
}
];
arr.forEach(({nickname}) => {
if (nickname) {
console.log(`Thats the property we want to extract: ${nickname}`);
break; // if you are not expecting this property name in other objects, otherwise no need to break
}
});
const obj =
[
{
"id":"1",
"name":"a",
"email":"abc#gmail.com",
"expiryType":"premium"
},
{
"id":"2",
"name":"b",
"email":"abc#gmail.com",
"expiryType":"gold"
},
{
"id":"3",
"name":"b",
"email":"test#gmail.com",
"expiryType":"premium"
},
]
can somebody please help me how to filter out objects where email is same but i want to keep the one with expiry Type is premium ? How to achieve this using Javascript
Expected output would be
const obj =
[
{
"id":"1",
"name":"a",
"email":"abc#gmail.com",
"expiryType":"premium"
},
{
"id":"3",
"name":"b",
"email":"test#gmail.com",
"expiryType":"premium"
},
]
Assuming you want to keep the latest year's entry, you can keep a Map of the email addresses and years you've seen. See comments:
// The new list
const filtered = [];
// Known emails
const known = new Map();
// Loop through...
for (const entry of obj) {
// Get this email and expiry
const {email, expiryYear} = entry;
// Get the previous info if any
const previous = known.get(email);
if (previous) {
// If the previous one is older than this one,
// replace it with this one
if (previous.expiryYear < expiryYear) {
filtered[previous.index] = entry;
}
} else {
// Add this to the known list and the filtered array
known.set(email, {
index: filtered.length,
expiryYear
});
filtered.push(entry);
}
}
const obj = [
{
"id":"1",
"name":"a",
"email":"abc#gmail.com",
"expiryYear":"2020"
},
{
"id":"2",
"name":"a",
"email":"abc#gmail.com",
"expiryYear":"2019"
},
{
"id":"3",
"name":"b",
"email":"test#gmail.com",
"expiryYear":"2020"
},
];
// The new list
const filtered = [];
// Known emails
const known = new Map();
// Loop through...
for (const entry of obj) {
// Get this email and expiry
const {email, expiryYear} = entry;
// Get the previous info if any
const previous = known.get(email);
if (previous) {
// If the previous one is older than this one,
// replace it with this one
if (previous.expiryYear < expiryYear) {
filtered[previous.index] = entry;
}
} else {
// Add this to the known list and the filtered array
known.set(email, {
index: filtered.length,
expiryYear
});
filtered.push(entry);
}
}
console.log(filtered);
This has the advantage of not constantly re-scanning the new list for known entries.
You can filter out whole object based on unique key you want as below.
const obj =
[
{
"id": "1",
"name": "a",
"email": "abc#gmail.com",
"expiryType": "premium"
},
{
"id": "2",
"name": "b",
"email": "abc#gmail.com",
"expiryType": "gold"
},
{
"id": "3",
"name": "b",
"email": "test#gmail.com",
"expiryType": "premium"
}
]
function arrayUnique(arr, uniqueKey) {
const flagList = []
return arr.filter(function(item) {
if (flagList.findIndex(flagItem => flagItem[uniqueKey] === item[uniqueKey]) === -1) {
flagList.push(item)
return true
}
})
}
Method Calling....
let newObj = arrayUnique(obj,'email')
Output:
newObj = [
{
"id": "1",
"name": "a",
"email": "abc#gmail.com",
"expiryType": "premium"
},
{
"id": "3",
"name": "b",
"email": "test#gmail.com",
"expiryType": "premium"
}
]
Hope this helps.
You can do it simply with 2 loops. Maybe not the fastes but the simplest:
function deleteDouble(array, objectKey) {
for (var i = 0; i < array.length; i++) {
for (var j = 0; j < array.length; j++) {
if (i == j) {
continue;
}
if (array[i][objectKey] == array[j][objectKey]) {
array.splice(i, 1);
i = 0;
j = 0;
break;
}
}
}
return array;
}
deleteDouble(obj, "email");
I have one javascript array and one object . Need help to sort javascript object keys based on the order number in another array
In subgroup array , I have name , order number. Need to sort Offerings keys based on that order number
const subgroup = [
{
"code": "6748",
"name": "test123",
"orderNumber": "0"
},
{
"code": "1234",
"name": "customdata",
"orderNumber": "1"
}
]
const offerings = {
"customdata" : [
{
"code": "Audi",
"color": "black"
}
],
"test123" : [
{
"brand": "Audi",
"color": "black"
}
]
}
I believe this should work for you. I've added some comments in the code that should hopefully do an okay job of explaining what is happening.
var subgroup = [{
"code": "6748",
"name": "test123",
"orderNumber": "0"
}, {
"code": "1234",
"name": "customdata",
"orderNumber": "1"
}];
var offerings = {
"customdata": [{
"code": "Audi",
"color": "black"
}],
"test123": [{
"brand": "Audi",
"color": "black"
}]
}
function sortObjectFromArray(refArray, sortObject, orderKey = 'order', linkKey = 'key') {
// Get copy of refArray
let reference = refArray.slice();
// Sort sortObject [ into an array at this point ]
let sorted = [];
for (let key in sortObject) {
// Searches the refArray for the linkKey, and returns the intended index
let index = reference.find((item) => item[linkKey] === key)[orderKey];
// Places the sortObject's value in the correct index of the 'sorted' Array
sorted[parseInt(index)] = [key, sortObject[key]];
};
// Return an object, created from previous 'sorted' Array
return sorted.reduce((obj, [key, value]) => {
obj[key] = value;
return obj;
}, {});
};
offerings = sortObjectFromArray(subgroup, offerings, 'orderNumber', 'name');
console.log(offerings);
This question already has answers here:
Get JavaScript object from array of objects by value of property [duplicate]
(17 answers)
Closed 3 years ago.
I have a JSON file containing 13k objects. I need to get only the objects which have the events { name: "Submitted"} property from it. events is an array of objects which contain multiple name properties. Here is a screenshot of how it looks:
{
"_id": "03c319a5-86d4-4ce6-ba19-1a50584cecb4",
"_rev": "21-7cb67ebb46c485ff443995fc27bdd950",
"doctype": "application",
"events": [{
"name": "change",
"time": 1532547503182
},
{
"name": "change",
"time": 1532547503182
},
{
"name": "submitted",
"time": 1532547503182
},
{
"name": "edited",
"time": 1532547503182
}
]
}
This is how I get all the object inside the json file:
$.getJSON("export.json", function(data) {
var data = [];
var arrays = data;
var i;
for (i = 0; i < arrays.length; i++) {
console.log(arrays[i]);
}
});
Now I need to push all the objects which have events[name:submitted] I get in arrays[i] into the doc[]. How can I filter the results?
You can filter your array of the object by filter method.
$.getJSON("export.json", function(data) {
var data = [];
var arrays = data;
var newArray = arrays.filter(function (el) {
return el.name == 'Submitted';
});
console.log(newArray);
});
You can also do in one line using ES6 arrow function
var newArray = arrays.filter(el => el.name === 'Submitted')
You can use filter(), checking each element in the events array to see if the name is equal to submitted:
const object = {
"_id": "03c319a5-86d4-4ce6-ba19-1a50584cecb4",
"_rev": "21-7cb67ebb46c485ff443995fc27bdd950",
"doctype": "application",
"events": [{
"name": "change",
"time": 1532547503182
},
{
"name": "change",
"time": 1532547503182
},
{
"name": "submitted",
"time": 1532547503182
},
{
"name": "edited",
"time": 1532547503182
}
]
}
const filtered = object.events.filter(obj => obj.name === 'submitted')
console.log(filtered)
I have an ko.observableArray with two dimensions, i.e. "id" and "name".
Id will always be distinct, but name can hold the same value.
self.myArray = ko.observableArray( [
{ "id": "1", "name": "Barbara" },
{ "id": "2", "name": "Edwin" },
{ "id": "3", "name": "Barbara" }
] );
However I want to filter the array so that my result holds only the first occurrence of "name".
The result I want is:
self. myFilteredArray = [
{ "id": "1", "name": "Barbara" },
{ "id": "2", "name": "Edwin" }
];
I have been trying to figure this out using ko.utils.arrayGetDistinctValues(), but how can I utilize it on solely one chosen dimension?
You could use a computed for this:
viewModel.myFilteredArray = ko.computed(function() {
var rv = [], names = [];
for(var i=0; i<this.myArray().length; i++) {
if(names.indexOf(this.myArray()[i].name) === -1) {
rv.push(this.myArray()[i]);
names.push(this.myArray()[i].name);
}
}
return rv;
}, viewModel);
I can suggest a function, that loops through the array, builds map of property values for each item and checks, whether the current value was already added. Something like this:
function filterByFirstOccurance(arr, prop) {
var propValuesHash = {},
result = [];
for (var i = 0, l = arr.length; i < l; i++) {
var item = arr[i],
propValue = item[prop];
if (item.hasOwnProperty(prop) && !propValuesHash[propValue]) {
propValuesHash[propValue] = true;
result.push(item);
}
}
return result;
};
Fiddle