Array.prototype.push()

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الدالة push() هي دالة تضيف عنصر أو عناصر إلى نهاية المصفوفة مع إعادة طول المصفوفة الجديد

Syntax

arr.push(element1, ..., elementN)

Parameters

elementN
تضاف العناصر إلى  نهاية المصفوفة 

قيمة الإرجاع

The new length property of the object upon which the method was called.

وصف

دالة push  هي دالة تقوم بإلحاق القيم للمصفوفة

push is intentionally generic. This method can be used with call() or apply() on objects resembling arrays. The push method relies on a length property to determine where to start inserting the given values. If the length property cannot be converted into a number, the index used is 0. This includes the possibility of length being nonexistent, in which case length will also be created.

The only native, array-like objects are strings, although they are not suitable in applications of this method, as strings are immutable.

أمثلة

إضافة عناصر إلى مجموعة

التعليمة البرمجية التالية : تقوم بإنشاء مصفوفة (sports ) تحتوي على عنصرين، ثم يتم إلحاق عنصرين إليها.
يحتوي المتغير (total)على طول الجديد للمصفوفة.

var sports = ['soccer', 'baseball'];
var total = sports.push('football', 'swimming');

console.log(sports); // ['soccer', 'baseball', 'football', 'swimming']
console.log(total);  // 4

دمج مصفوفتين

هذا المثال يستخدم  apply() لإلحاق كل عناصر  المصفوفة الثانية بالمصفوفة الأولى

var vegetables = ['parsnip', 'potato'];
var moreVegs = ['celery', 'beetroot'];

// دمج المصفوفة الثانية بالأولى
//كانه كتب
//vegetables.push('celery', 'beetroot');
Array.prototype.push.apply(vegetables, moreVegs);

console.log(vegetables); // ['parsnip', 'potato', 'celery', 'beetroot']

استخدام كائن بطريقة تشبه المصفوفة

As mentioned above, push is intentionally generic, and we can use that to our advantage. Array.prototype.push can work on an object just fine, as this example shows. Note that we don't create an array to store a collection of objects. Instead, we store the collection on the object itself and use call on Array.prototype.push to trick the method into thinking we are dealing with an array, and it just works, thanks to the way JavaScript allows us to establish the execution context however we please.

var obj = {
    length: 0,

    addElem: function addElem (elem) {
        // obj.length is automatically incremented every time an element is added.
        [].push.call(this, elem);
    }
};

// Let's add some empty objects just to illustrate.
obj.addElem({});
obj.addElem({});
console.log(obj.length);
// → 2

لاحظ أنه على الرغم من أن الكائن ليس مصفوفة،فإن دالة push نجحت في تزايد خاصية طول الكائن كما لو أننا نتعامل مع مصفوفة عادية

Specifications

Specification Status Comment
ECMAScript 3rd Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.2.
ECMAScript 5.1 (ECMA-262)
The definition of 'Array.prototype.push' in that specification.
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Array.prototype.push' in that specification.
Standard  
ECMAScript 2017 Draft (ECMA-262)
The definition of 'Array.prototype.push' in that specification.
Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 1.0 1.0 (1.7 or earlier) 5.5 (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

See also

Document Tags and Contributors

 Contributors to this page: Dr-Rakcha
 Last updated by: Dr-Rakcha,