endsWith in JavaScript

Question

How can I check if a string ends with a particular character in JavaScript?

Example: I have a string

var str = \"mystring#\";

I wa

Answer 1

This is the implementation of endsWith : String.prototype.endsWith = function (str) { return this.length >= str.length && this.substr(this.length - str.length) == str; }

Answer 2

From developer.mozilla.org String.prototype.endsWith()

Summary

The endsWith() method determines whether a string ends with the characters of another string, returning true or false as appropriate.

Syntax

str.endsWith(searchString [, position]);

Parameters

• searchString : The characters to be searched for at the end of this string.

• position : Search within this string as if this string were only this long; defaults to this string's actual length, clamped within the range established by this string's length.

Description

This method lets you determine whether or not a string ends with another string.

Examples

var str = "To be, or not to be, that is the question.";

alert( str.endsWith("question.") );  // true
alert( str.endsWith("to be") );      // false
alert( str.endsWith("to be", 19) );  // true

Specifications

ECMAScript Language Specification 6th Edition (ECMA-262)

Browser compatibility

Answer 3

1. Unfortunately not.
2. if( "mystring#".substr(-1) === "#" ) {}

Answer 4

Didn't see apporach with slice method. So i'm just leave it here:

function endsWith(str, suffix) {
    return str.slice(-suffix.length) === suffix
}

Answer 5

if you dont want to use lasIndexOf or substr then why not just look at the string in its natural state (ie. an array)

String.prototype.endsWith = function(suffix) {
    if (this[this.length - 1] == suffix) return true;
    return false;
}

or as a standalone function

function strEndsWith(str,suffix) {
    if (str[str.length - 1] == suffix) return true;
    return false;
}

Answer 6

So many things for such a small problem, just use this Regular Expression

var str = "mystring#";
var regex = /^.*#$/

if (regex.test(str)){
  //if it has a trailing '#'
}