js Array prototype splice
This method changes array's content by removing existing elements and/or adding new elements.
Syntax
array.splice(start, deleteCount[, item1[, item2[, ...]]])Parameters
| Parameter | Description | Necessity |
|---|---|---|
| start | Index at which to start changing the array. | Required |
| deleteCount | An integer indicating the number of old array elements to remove. If deleteCount is 0, no elements are removed. In this case, you should specify at least one new element. | Required |
| itemN | The element to add to the array. If you don't specify any elements, splice() will only remove elements from the array. | Optional |
Returns
An array containing the deleted elements. If only one element is removed, an array of one element is returned. If no elements are removed, an empty array is returned.
Examples
var arr = new Array("4", "11", "2", "10", "3", "1");
arr.splice(2, 2, "21", "31");
document.write(arr);
// Output: 4,11,21,31,3,1var myFish = ['angel', 'clown', 'mandarin', 'surgeon'];
// removes 0 elements from index 2, and inserts 'drum'
var removed = myFish.splice(2, 0, 'drum');
// myFish is ['angel', 'clown', 'drum', 'mandarin', 'surgeon']
// removed is [], no elements removed
// removes 1 element from index 3
removed = myFish.splice(3, 1);
// myFish is ['angel', 'clown', 'drum', 'surgeon']
// removed is ['mandarin']