What is the difference between the substr() and substring() functions in JavaScript?

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devquora

Posted On: Feb 22, 2018

 

Difference between the substr() and substring() functions in JavaScript.

The substr() function has the form substr(startIndex,length). It returns the substring from startIndex and returns ‘length’ number of characters.

var s = "hello";
( s.substr(1,4) == "ello" ) // true

The substring() function has the form substring(startIndex,endIndex). It returns the substring from startIndex up to endIndex – 1.

var s = "hello";
( s.substring(1,4) == "ell" ) // true

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