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String.prototype.trim() Method in String Class of Javascript Syntax with Examples
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Usage 
trim() used to remove whitespaces from the sting.

if more than one whitespace given between the strings this function allows only one whitespace and remove other whitespaces.
Syntax 
String.trim();
Example
var userName = "ab    c d  e    ";

//Removes the whitespaces if it more than one.keeps only one whitespace between elements
var char1 = userName.trim();
document.write("The element is "+char1+" .");
Output 
The element is ab c d e.
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