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The slice() method returns selected elements in an array, as a new array. The slice() method selects from a given start, up to a (not inclusive) given end. The slice() method does not change the original array.
- Overview
- Syntax
- Description
- Examples
- Browser compatibility
- See also
The slice() method of Array instances returns a shallow copy of a portion of an array into a new array object selected from start to end (end not included) where start and end represent the index of items in that array. The original array will not be modified.
Parameters
start Optional Zero-based index at which to start extraction, converted to an integer. •Negative index counts back from the end of the array — if -array.length <= start < 0, start + array.length is used. •If start < -array.length or start is omitted, 0 is used. •If start >= array.length, nothing is extracted. end Optional Zero-based index at which to end extraction, converted to an integer. slice() extracts up to but not including end. •Negative index counts back from the end of the array — if -array.length <= end < 0, end + array.length is used. •If end < -array.length, 0 is used. •If end >= array.length or end is omitted, array.length is used, causing all elements until the end to be extracted. •If end implies a position before or at the position that start implies, nothing is extracted.
Return value
A new array containing the extracted elements.
The slice() method is a copying method. It does not alter this but instead returns a shallow copy that contains some of the same elements as the ones from the original array.
The slice() method preserves empty slots. If the sliced portion is sparse, the returned array is sparse as well.
Return a portion of an existing array Using slice
In the following example, slice creates a new array, newCar, from myCar. Both include a reference to the object myHonda. When the color of myHonda is changed to purple, both arrays reflect the change. This script writes:
Calling slice() on non-array objects
The slice() method reads the length property of this. It then reads the integer-keyed properties from start to end and defines them on a newly created array.
Using slice() to convert array-like objects to arrays
The slice() method is often used with bind() and call() to create a utility method that converts an array-like object into an array.
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•Polyfill of Array.prototype.slice in core-js
•Indexed collections guide
•Array
•Array.prototype.pop()
•Array.prototype.shift()
•Array.prototype.concat()
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