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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