The split()
method splits a String object into an array of strings by separating the string into substrings.
str.split([separator[, limit]])
separator
separator
is treated as a string or a regular expression. If separator
is omitted, the array returned contains one element consisting of the entire string. If separator
is an empty string, str
is converted to an array of characters.limit
split()
method still splits on every match of separator
, but it truncates the returned array to at most limit
elements.The split()
method returns the new array.
When found, separator
is removed from the string and the substrings are returned in an array. If separator
is not found or is omitted, the array contains one element consisting of the entire string. If separator
is an empty string, str
is converted to an array of characters.
If separator
is a regular expression that contains capturing parentheses, then each time separator
is matched, the results (including any undefined results) of the capturing parentheses are spliced into the output array. However, not all browsers support this capability.
split()
The following example defines a function that splits a string into an array of strings using the specified separator. After splitting the string, the function displays messages indicating the original string (before the split), the separator used, the number of elements in the array, and the individual array elements.
function splitString(stringToSplit, separator) { var arrayOfStrings = stringToSplit.split(separator); console.log('The original string is: "' + stringToSplit + '"'); console.log('The separator is: "' + separator + '"'); console.log('The array has ' + arrayOfStrings.length + ' elements: ' + arrayOfStrings.join(' / ')); } var tempestString = 'Oh brave new world that has such people in it.'; var monthString = 'Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec'; var space = ' '; var comma = ','; splitString(tempestString, space); splitString(tempestString); splitString(monthString, comma);
This example produces the following output:
The original string is: "Oh brave new world that has such people in it." The separator is: " " The array has 10 elements: Oh / brave / new / world / that / has / such / people / in / it. The original string is: "Oh brave new world that has such people in it." The separator is: "undefined" The array has 1 elements: Oh brave new world that has such people in it. The original string is: "Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec" The separator is: "," The array has 12 elements: Jan / Feb / Mar / Apr / May / Jun / Jul / Aug / Sep / Oct / Nov / Dec
In the following example, split()
looks for 0 or more spaces followed by a semicolon followed by 0 or more spaces and, when found, removes the spaces from the string. nameList
is the array returned as a result of split()
.
var names = 'Harry Trump ;Fred Barney; Helen Rigby ; Bill Abel ;Chris Hand '; console.log(names); var re = /\s*;\s*/; var nameList = names.split(re); console.log(nameList);
This logs two lines; the first line logs the original string, and the second line logs the resulting array.
Harry Trump ;Fred Barney; Helen Rigby ; Bill Abel ;Chris Hand Harry Trump,Fred Barney,Helen Rigby,Bill Abel,Chris Hand
In the following example, split()
looks for 0 or more spaces in a string and returns the first 3 splits that it finds.
var myString = 'Hello World. How are you doing?'; var splits = myString.split(' ', 3); console.log(splits);
This script displays the following:
Hello,World.,How
If separator
contains capturing parentheses, matched results are returned in the array.
var myString = 'Hello 1 word. Sentence number 2.'; var splits = myString.split(/(\d)/); console.log(splits);
This script displays the following:
Hello ,1, word. Sentence number ,2,.
split()
var str = 'asdfghjkl'; var strReverse = str.split('').reverse().join(''); // 'lkjhgfdsa' // split() returns an array on which reverse() and join() can be applied
Bonus: use ===", "#Identity_strict_equality_(===) operator to test if the original string was palindrome.
Created by Mozilla Contributors, license: CC-BY-SA 2.5