In this post Get all unique values in a JavaScript array (remove duplicates) one of the answers shows how to get unique items for an object array based on a value of a field (shown below), but it is in ES6 notation and I need help converting it to ES5 (no arrows or elipses).
let objArr = [{
id: '123'
}, {
id: '123'
}, {
id: '456'
}];
objArr = objArr.reduce((acc, cur) => [
...acc.filter((obj) => obj.id !== cur.id), cur
], []);
console.log(objArr);
i hope this help
var objArr = [{
id: '123'
}, {
id: '123'
}, {
id: '456'
}];
var newObjArr = objArr.reduce(function(previous, current){
var alredyExists = previous.filter(function(item){
return item.id === current.id
}).length > 0
if(!alredyExists){
previous.push(current)
}
return previous
}, [])
console.log(newObjArr)
let objArr = [{ id: '123' }, { id: '123' }, { id: '456' }]
objArr = objArr.reduce(function (acc, cur) {
return acc.filter(function (obj) {
return obj.id !== cur.id
}).concat([cur])
}, [])
console.log(objArr)You can use reduce method and map function:
let unique = objArr.reduce(function(a, c){
a[c.id] = a[c.id] || {};
a[c.id] = c.id;
return a;
},{})
console.log(Object.values(unique).map(function(s){return {id: s}}))
An example:
let objArr = [{
id: '123'
}, {
id: '123'
}, {
id: '456'
}];
let unique = objArr.reduce(function(a, c){
a[c.id] = a[c.id] || {};
a[c.id] = c.id;
return a;
},{})
console.log(Object.values(unique).map(function(s){return {id: s}}))