Javascript push_array and in_array

Question

What is the equivalents of php functions push_array and in_array in javascript?

Arrays are simple (not multidimensional).

Haven't found something native.

Answer 1

You're looking for the push method and the indexOf method.

Note that indexOf is not supported by IE, so you'll need to implement it yourself, like this:

if (!Array.prototype.indexOf)
{
 Array.prototype.indexOf = function(searchElement /*, fromIndex */)
 {
 "use strict";
 if (this === void 0 || this === null)
 throw new TypeError();
 var t = Object(this);
 var len = t.length >>> 0;
 if (len === 0)
 return -1;
 var n = 0;
 if (arguments.length > 0)
 {
 n = Number(arguments[1]);
 if (n !== n) // shortcut for verifying if it's NaN
 n = 0;
 else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0))
 n = (n > 0 || -1) * Math.floor(Math.abs(n));
 }
 if (n >= len)
 return -1;
 var k = n >= 0
 ? n
 : Math.max(len - Math.abs(n), 0);
 for (; k < len; k++)
 {
 if (k in t && t[k] === searchElement)
 return k;
 }
 return -1;
 };
}

(copied from MDC)

Answer 2

push_array:

This is native to the Array object in JavaScript:

var someArray = [];
someArray.push(value);

in_array:

This is not native to the Array in JavaScript however some browsers have support for Array.indexOf which can be compared to -1. If that is not supported than you need to iterate over the items.

function inArray(elem, array) {
 if (array.indexOf) {
 return array.indexOf(elem) > -1;
 }
 for (var i = 0, length = array.length; i < length; i++) {
 if (array[ i ] === elem ) {
 return true;
 }
 }
 return false;
}

Answer 3

You have to be using the JavaScript Array object. Then you can use .push().

For find: How do I check if an array includes an object in JavaScript?