search in array in 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) )
console.log( simpleArray.find(e => e === 10) )
console.log( objectArray.find(e => e.name === 'John') )
Example 2: javascript array.find
const array1 = [5, 12, 8, 130, 44];
const found = array1.find(element => element > 10);
console.log(found);
Example 3: javascript array find
var myArrayOfAges = [1,4,6,8,9,13,16,21,53,78];
var result = myArrayOfAges.find(age => age >= 12);
console.log(result);
if (!Array.prototype.find) {
Object.defineProperty(Array.prototype, 'find', {
value: function(predicate) {
if (this == null) {
throw TypeError('"this" is null or not defined');
}
var o = Object(this);
var len = o.length >>> 0;
if (typeof predicate !== 'function') {
throw TypeError('predicate must be a function');
}
var thisArg = arguments[1];
var k = 0;
while (k < len) {
var kValue = o[k];
if (predicate.call(thisArg, kValue, k, o)) {
return kValue;
}
k++;
}
return undefined;
},
configurable: true,
writable: true
});
}
Example 4: check items in array javascript
function checkAllEven(arr) {
return arr.every(function(x){
return x % 2 === 0
})
}