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string.slice(startIndex, endIndex)

Arguments

startIndex

The integer position of the first character to extract from string. If startIndex is negative, the position is measured from the end of the string, where -1 is the last character, -2 is the second-to-last character, and so on (i.e., a negative startIndex specifies the character at string.length + startIndex).

endIndex

The integer position of the character after the last character to extract from string. If endIndex is negative, the position is measured from the end of the string, where -1 is the last character, -2 is the second-to-last character, and so on (i.e., a negative endIndex specifies the character at string.length + endIndex). Defaults to string.length if omitted.

Returns

A substring of string, starting at startIndex and ending at endIndex - 1, where both startIndex and endIndex are zero-relative.

Description

The slice( ) method is one of three methods that can be used to extract a substring from a string (the others being substring( ) and substr( )). The slice( ) method offers the option of using negative start and end index values, which allows us to extract a substring by measuring back from the end of a string.

Usage

Note that slice( ) does not modify string; it returns a completely new string.

Example

var fullName = "Steven Sid Mumby";
middleName = fullName.slice(7, 10);   // Assigns "Sid" to middleName
middleName = fullName.slice(-9, -6);  // Also assigns "Sid" to middleName

See Also

String.substr( ), String.substring( ); "The slice( ) function," and "Combining String Examination with Substring Extraction," in Chapter 4

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