How to set default argument values in JavaScript functions

Question: How to set default argument values in JavaScript functions

Answer:

function to set default value.

function defaultValuefunction(a, b) {
 if (a === undefined) 
   a = "a default value";
 
 if (b === undefined) 
   b = "b default value";
  
 console.log(a);
 console.log(b);
}

function call with parameter.

defaultValuefunction(12, 13); //function call with parameter

Output:

12
13

function call without parameter.

defaultValuefunction(); //function call without parameter

Output:

a default value
b default value

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