Example 1: find in array of objects javascript
let arr = [
{ name:"string 1", value:"this", other: "that" },
{ name:"string 2", value:"this", other: "that" }
];
let obj = arr.find(o => o.name === 'string 1');
console.log(obj);
Example 2: javascript find item in array of objects
var __POSTS = [
{ id: 1, title: 'Apple', description: 'Description of post 1' },
{ id: 2, title: 'Orange', description: 'Description of post 2' },
{ id: 3, title: 'Guava', description: 'Description of post 3' },
{ id: 4, title: 'Banana', description: 'Description of post 4' }
];
var __FOUND = __POSTS.find(function(post, index) {
if(post.title == 'Guava')
return true;
});
// On success __FOUND will contain the complete element (an object)
// On failure it will contain undefined
console.log(__FOUND); // { id: 3, title: 'Guava', description: 'Description of post 3' }
Example 3: search an array of objects with specific object property value
// MDN Ref:
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find
var result = jsObjects.find(obj => {
return obj.b === 6
});
Example 4: how to get array from object in javascript
let result = objArray.map(({ foo }) => foo)
Example 5: return an object from an array javascript
myArray.find(item => item.isAstronaut)
Example 6: javascript array find
// Use array.find() like this:
var myArrayOfAges = [1,4,6,8,9,13,16,21,53,78];
var result = myArrayOfAges.find(age => age >= 12);
console.log(result); // Output: 13
/* ------ Below is a polyfill from Mozilla: ------ */
// https://tc39.github.io/ecma262/#sec-array.prototype.find
if (!Array.prototype.find) {
Object.defineProperty(Array.prototype, 'find', {
value: function(predicate) {
// 1. Let O be ? ToObject(this value).
if (this == null) {
throw TypeError('"this" is null or not defined');
}
var o = Object(this);
// 2. Let len be ? ToLength(? Get(O, "length")).
var len = o.length >>> 0;
// 3. If IsCallable(predicate) is false, throw a TypeError exception.
if (typeof predicate !== 'function') {
throw TypeError('predicate must be a function');
}
// 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
var thisArg = arguments[1];
// 5. Let k be 0.
var k = 0;
// 6. Repeat, while k < len
while (k < len) {
// a. Let Pk be ! ToString(k).
// b. Let kValue be ? Get(O, Pk).
// c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
// d. If testResult is true, return kValue.
var kValue = o[k];
if (predicate.call(thisArg, kValue, k, o)) {
return kValue;
}
// e. Increase k by 1.
k++;
}
// 7. Return undefined.
return undefined;
},
configurable: true,
writable: true
});
}