String.prototype.slice()

Summary

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) where sourceLength is the length of the string.
endSlice
The zero-based index at which to end extraction. If omitted, slice extracts to the end of the string. If negative, it is treated as (sourceLength-endSlice) where sourceLength is the length 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

Example: Using slice to create a new string

The following example uses slice to create a new string.

// assumes a print function is defined
var str1 = "The morning is upon us.";
var str2 = str1.slice(4, -2);

alert(str2); // OUTPUT: morning is upon u

Example: 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. Standard Initial definition.
Implemented in JavaScript 1.2
ECMAScript Language Specification 5.1th Edition (ECMA-262) Standard  
ECMAScript Language Specification 6th Edition (ECMA-262) 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)

See also

Document Tags and Contributors

Last updated by: fscholz,
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