Remove whitespace from string javascript

• To remove white space in a string in JavaScript at the starting and ending. i.e both sides of a string we have trim() method in JavaScript.
•  By Using .trim() method we can remove white spaces at both sides of a string.
• var str = "       instanceofjava.com        ";
  alert(str.trim());
• Will alert a popup with instanceofjava.com.

Javascript remove last character if comma 

• If  we want to remove last character of a string then we need to use replace method in JavaScript.
• str = str.replace(/,\s*$/, "");
• We can also use slice method to remove last character.

Remove specific characters from a string in Javascript

• To remove specific character from string in java script we can use

1. var string = 'www.Instanceofjava.com'; 
2. string.replace(/^www.+/i, ''); 'Instanceofjava.com'