String.fromCharCode (code1, code2, code3, ...)

Returns a string created using the input character codes:

>>> String.fromCharCode(115, 99, 114, 105, 112, 116);

"script"

length

The number of characters in the string.

>>> new String('four').length

4

charAt(pos)

Returns the character at the specified position. Positions start at 0.

>>> "script".charAt(0);

"s"

charCodeAt(pos)

Returns the code of the character at the specified position.

>>> "script".charCodeAt(0);

115

concat(str1, str2, ....)

Return a new string glued from the input pieces.

>>> "".concat('zig', '-', 'zag');

"zig-zag"

indexOf(needle, start)

If the needle matches a part of the string, the position of the match is returned. The optional second parameter tells where the search should start from. Returns -1 if no match is found.

>>> "javascript".indexOf('scr')

4

>>> "javascript".indexOf('scr', 5)

-1

lastIndexOf(needle, start)

Same as indexOf() but starts the search from the end of the string. The last occurence of "a":

>>> "javascript".lastIndexOf('a') 

3

localeCompare(needle)

Compares two strings in the current locale. Returns 0 if the two strings are equal, 1 if the needle gets sorted before the string object, -1 otherwise.

>>> "script".localeCompare('crypt')

1

>>> "script".localeCompare('sscript')

-1

>>> "script".localeCompare('script')

0

match(regexp)

Accepts a regular expression object and returns an array of matches.

>>> "R2-D2 and C-3PO".match(/[0-9]/g)

["2", "2", "3"]

replace(needle, replacement)

Allows you to replace the matching results of a regexp pattern. The replacement can also be a callback function. Capturing patterns are available as $1, $2,...$9.

>>> "R2-D2".replace(/2/g, '-two')

"R-two-D-two"

>>> "R2-D2".replace(/(2)/g, '$1$1')

"R22-D22"

search(regexp)

Returns the position of the first regular expression match.

>>> "C-3PO".search(/[0-9]/)

2

slice(start, end)

Returns the part of a string identified by start and end position. If start is negative, then the start position is length + start, similarly if the end parameter is negative, the end position is length + end.

>>> "R2-D2 and C-3PO".slice(4,13)

"2 and C-3"

>>> "R2-D2 and C-3PO".slice(4,-1)

"2 and C-3P"

split(separator, limit)

Turns a string into an array. The second parameter, limit, is optional. The separator can also be a regular expression.

>>> "1,2,3,4".split(',')

["1", "2", "3", "4"]

>>> "1,2,3,4".split(',', 2)

["1", "2"]

substring(start, end)

Similar to slice(). When start or end are negative or invalid, they are considered 0. If they are greater than the string length, they are considered to be the length. If end > start, their values are swapped.

>>> "R2-D2 and C-3PO".substring(4, 13)

"2 and C-3"

>>> "R2-D2 and C-3PO".substring(13, 4)

"2 and C-3"

toLowerCase()

toLocaleLowerCase()

Transforms the string to lower case.

>>> "JAVA".toLowerCase()

"java"

toUpperCase()

toLocaleUpperCase()

Transforms the string to upper case.

>>> "script".toUpperCase()

"SCRIPT"