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The slice()
method extracts a section of a string and returns a new string.
Syntax
str.slice(beginSlice[, endSlice])
Parameters
beginSlice
- The zero-based index at which to begin extraction. If negative, it is treated as
sourceLength + beginSlice
wheresourceLength
is the length of the string (for example, ifbeginSlice
is -3 it is treated assourceLength - 3
). endSlice
- Optional. The zero-based index at which to end extraction. If omitted,
slice()
extracts to the end of the string. If negative, it is treated assourceLength + endSlice
wheresourceLength
is the length of the string (for example, ifendSlice
is -3 it is treated assourceLength - 3)
.
Return value
A new string containing the extracted section of the string.
Description
slice()
extracts the text from one string and returns a new string. Changes to the text in one string do not affect the other string.
slice()
extracts up to but not including endSlice
. str.slice(1, 4)
extracts the second character through the fourth character (characters indexed 1, 2, and 3).
As an example, str.slice(2, -1)
extracts the third character through the second to last character in the string.
Examples
Using slice()
to create a new string
The following example uses slice()
to create a new string.
var str1 = 'The morning is upon us.'; var str2 = str1.slice(4, -2); console.log(str2); // OUTPUT: morning is upon u
Using slice()
with negative indexes
The following example uses slice()
with negative indexes.
var str = 'The morning is upon us.'; str.slice(-3); // returns 'us.' str.slice(-3, -1); // returns 'us' str.slice(0, -1); // returns 'The morning is upon us'
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 3rd Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.2. |
ECMAScript 5.1 (ECMA-262) The definition of 'String.prototype.slice' in that specification. |
Standard | |
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'String.prototype.slice' in that specification. |
Standard | |
ECMAScript 2017 Draft (ECMA-262) The definition of 'String.prototype.slice' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |