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

Question

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

User · Answer

You do not really need jQuery for such tasks. In the ES6 specification they already have out of the box methods startsWith and endsWith.

var str = "To be, or not to be, that is the question.";
alert(str.startsWith("To be"));         // true
alert(str.startsWith("not to be"));     // false
alert(str.startsWith("not to be", 10)); // true

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

Currently available in FF and Chrome. For old browsers you can use their polyfills or substr

User · Answer

One option is to use regular expressions   if  str match   Hello            do this if begins with Hello    if  str match  World             do this if ends in world

User · Answer

You can always extend String prototype like this       Checks that string starts with the specific string if  typeof String prototype startsWith     function         String prototype startsWith   function  str            return this slice 0  str length     str                Checks that string ends with the specific string    if  typeof String prototype endsWith     function         String prototype endsWith   function  str            return this slice -str length     str             And use it like this   var str    Hello World    if  str startsWith  Hello             your string starts with  Hello     if  str endsWith  World             your string ends with  World

User · Answer

There is no need of jQuery to do that  You could code a jQuery wrapper but it would be useless so you should better use  var str    Hello World    window alert  Starts with Hello         Hello i test str             window alert  Ends with Hello        Hello  i test str      as the match   method is deprecated   PS   the  i  flag in RegExp is optional and stands for case insensitive  so it will also return true for  hello    hEllo   etc

User · Answer

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

User · Answer

For startswith  you can use indexOf   if str indexOf  Hello      0           ref  and you can do the maths based on string length to determine  endswith    if str lastIndexOf  Hello      str length -  Hello  length

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

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