Inserts new elements at the start of an array.
Syntaxunshift([ item1 [, item2 [, . . . [, itemN]]]])
The following example illustrates the use of the unshift method.
var ar = new Array();
ar.unshift(10, 11);
ar.unshift(12, 13, 14);
document.write(ar.toString());
Remarks
The unshift method inserts elements into the start of an array, so they appear in the same order in which they appear in the argument list.
See also Specification[15.4.4.13 Array.prototype.unshift ( [ item1 [ , item2 , … ] ] )] ECMAScript® Language Specification Standard ECMA-262 5.1 Edition / June 2011
AttributionsMicrosoft Developer Network: Article
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