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המתודה ()unshift  מוסיפה אלמנט אחד או יותר לתחילת מערך ומחזירה את גודלו החדש של המערך. 


arr.unshift(element1[, ...[, elementN]])


אלמנטים להוספה לתחילת המערך.

ערך מוחזר

את ערך השדה length החדש של המערך עליו הופעלה המתודה.


המתודה unshift מכניסה את ערכי האלמנטים שקיבלה כפרמטר לתחילת אובייקט המערך. 

unshift is intentionally generic; this method can be called or applied to objects resembling arrays. Objects which do not contain a length property reflecting the last in a series of consecutive, zero-based numerical properties may not behave in any meaningful manner.


var arr = [1, 2];

arr.unshift(0); // result of call is 3, the new array length
// arr is [0, 1, 2]

arr.unshift(-2, -1); // = 5
// arr is [-2, -1, 0, 1, 2]

// arr is [[-3], -2, -1, 0, 1, 2]


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.unshift' in that specification.
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Array.prototype.unshift' in that specification.
ECMAScript Latest Draft (ECMA-262)
The definition of 'Array.prototype.unshift' in that specification.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
unshiftChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 5.5Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yesnodejs Full support Yes


Full support  
Full support

See also

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