string - endsWith in JavaScript -

how can check if string ends particular character in javascript?

example: have string

var str = "mystring#"; 

i want know if string ending #. how can check it?

1. is there endswith() method in javascript?

2. one solution have take length of string , last character , check it.

is best way or there other way?

update (nov 24th, 2015):

this answer posted in year 2010 (six years back.) please take note of these insightful comments:

• shauna - update googlers - looks ecma6 adds function. mdn article shows polyfill. https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/string/endswith

• t.j. crowder - creating substrings isn't expensive on modern browsers; may have been in 2010 when answer posted. these days, simple this.substr(-suffix.length) === suffix approach fastest on chrome, same on ie11 indexof, , 4% slower (fergetaboutit territory) on firefox: jsperf.com/endswith-stackoverflow/14 , faster across board when result false: jsperf.com/endswith-stackoverflow-when-false of course, es6 adding endswith, point moot. :-)

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original answer:

i know year old question... need , need work cross-browser so... combining everyone's answer , comments , simplifying bit:

string.prototype.endswith = function(suffix) {     return this.indexof(suffix, this.length - suffix.length) !== -1; }; 

• doesn't create substring
• uses native indexof function fastest results
• skip unnecessary comparisons using second parameter of indexof skip ahead
• works in internet explorer
• no regex complications

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also, if don't stuffing things in native data structure's prototypes, here's standalone version:

function endswith(str, suffix) {     return str.indexof(suffix, str.length - suffix.length) !== -1; } 

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edit: noted @hamish in comments, if want err on safe side , check if implementation has been provided, can adds typeof check so:

if (typeof string.prototype.endswith !== 'function') {     string.prototype.endswith = function(suffix) {         return this.indexof(suffix, this.length - suffix.length) !== -1;     }; }