JavaScript Array unshift() Method
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JavaScript Array unshift() Method
❮ JavaScript Array Reference
Example
Add new items to the beginning of an array:
var fruits = ["Banana", "Orange", "Apple", "Mango"];
fruits.unshift("Lemon","Pineapple");
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The result of fruits will be:
Lemon,Pineapple,Banana,Orange,Apple,MangoTry it Yourself »
Definition and Usage
The unshift() method adds new items to the beginning of an array, and returns the new length.
Note: This method changes the length of an array.
Tip: To add new items at the end of an array, use the push() method.
Browser Support
The numbers in the table specify the first browser version that fully supports the method.
| Method | |||||
|---|---|---|---|---|---|
| unshift() | 1.0 | 5.5 | 1.0 | Yes | Yes |
Note: The unshift() method returns undefined in Internet Explorer 8 and earlier versions.
Syntax
array.unshift(item1, item2, ..., itemX)Parameter Values
| Parameter | Description |
|---|---|
item1, item2, ..., itemX | Required. The item(s) to add to the beginning of the array |
Technical Details
| Return Value: | A Number, representing the new length of the array |
|---|---|
| JavaScript Version: | ECMAScript 1 |
❮ JavaScript Array Reference
