String.prototype.endsWith()
The endsWith()
method determines
whether a string ends with the characters of a specified string, returning
true
or false
as appropriate.
Syntax
endsWith(searchString)
endsWith(searchString, length)
Parameters
searchString
-
The characters to be searched for at the end of
str
. length
Optional-
If provided, it is used as the length of
str
. Defaults tostr.length
.
Return value
true
if the given characters are found at the end of the
string; otherwise, false
.
Description
This method lets you determine whether or not a string ends with another string. This method is case-sensitive.
Examples
Using endsWith()
let str = 'To be, or not to be, that is the question.'
console.log(str.endsWith('question.')) // true
console.log(str.endsWith('to be')) // false
console.log(str.endsWith('to be', 19)) // true
Polyfill
This method has been added to the ECMAScript 6 specification and may not be available
in all JavaScript implementations yet. However, you can polyfill
String.prototype.endsWith()
with the following snippet:
if (!String.prototype.endsWith) {
String.prototype.endsWith = function(search, this_len) {
if (this_len === undefined || this_len > this.length) {
this_len = this.length;
}
return this.substring(this_len - search.length, this_len) === search;
};
}
Specifications
Specification |
---|
ECMAScript Language Specification # sec-string.prototype.endswith |
Browser compatibility
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