How to know that a string starts/ends with a specific string in jQuery?

user_149206 0
Viewed 254647

I want to know if a string starts with the specified character/string or ends with it in jQuery.

For Example:

var str = 'Hello World';

if( str starts with 'Hello' ) {
   alert('true');
} else {
   alert('false');
}

if( str ends with 'World' ) {
   alert('true');
} else {
   alert('false');
}

If there is not any function then any alternative ?

jquery javascript string
6 Answers

ES6 now supports the startsWith() and endsWith() method for checking beginning and ending of strings. If you want to support pre-es6 engines, you might want to consider adding one of the suggested methods to the String prototype.

if (typeof String.prototype.startsWith != 'function') {
  String.prototype.startsWith = function (str) {
    return this.match(new RegExp("^" + str));
  };
}

if (typeof String.prototype.endsWith != 'function') {
  String.prototype.endsWith = function (str) {
    return this.match(new RegExp(str + "$"));
  };
}

var str = "foobar is not barfoo";
console.log(str.startsWith("foob"); // true
console.log(str.endsWith("rfoo");   // true
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