Array Search Javascript Code Example

Example 1: find element in array javascript

const simpleArray = [3, 5, 7, 15]; const objectArray = [{ name: 'John' }, { name: 'Emma' }]  console.log( simpleArray.find(e => e === 7) ) // expected output 7  console.log( simpleArray.find(e => e === 10) ) // expected output undefined  console.log( objectArray.find(e => e.name === 'John') ) // expected output { name: 'John' }

Example 2: javascript find

const inventory = [   {name: 'apples', quantity: 2},   {name: 'cherries', quantity: 8}   {name: 'bananas', quantity: 0},   {name: 'cherries', quantity: 5}   {name: 'cherries', quantity: 15}    ];  const result = inventory.find( ({ name }) => name === 'cherries' );  console.log(result) // { name: 'cherries', quantity: 5 }

Example 3: javascript array.find

const array1 = [5, 12, 8, 130, 44];  const found = array1.find(element => element > 10);  console.log(found); // expected output: 12

Example 4: function search in javascript array

// function to search array using for loop function findInArray(ar, val) {     for (var i = 0,len = ar.length; i < len; i++) {         if ( ar[i] === val ) { // strict equality test             return i;         }     }     return -1; }  // example array var ar = ['Rudi', 'Morie', 'Halo', 'Miki', 'Mittens', 'Pumpkin']; // test the function  alert( findInArray(ar, 'Rudi') ); // 0 (found at first element) alert( findInArray(ar, 'Coco') ); // -1 (not found)

Example 5: array find

const array1 = [5, 12, 8, 130, 44];  const found = array1.find(element => element > 10);  console.log(found); // expected output: 12

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   }); }