Anil Singh | Code-sample.com

The live example link http://embed.plnkr.co/VgRD8B/ //DECLARE OPTIONAL PARAMETERS IN BELOW FUNCTION function myFunction(i, j) {     i = i || 0;     j = j || 0;    //IN THE ABOVE LINE, (i/j) WILL BE SET EITHER TO VALUE OF (i/j) OR TO DEFAULT VALUE (0). } For example in detail < !DOCTYPE html > < html > < head >     < meta charset ="utf-8" />     < title > J avaScript optional arguments in function </ title >     < script src ="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></ script >     < script >         //DECLARE OPTIONAL PARAMETERS IN BELOW FUNCTION         function myFunction(i, j) {             i = i || 0;      ...