In this tutorial, we are going to learn about how to set default parameter values to a function in JavaScript.
Default function parameters are introduced in es6, which help us to initialize the parameter with a default value.
Note: In JavaScript, if we don’t pass any value to function parameters, it will be initialized with a value undefined.
Setting the default parameter values
We can set the default parameter values to a function at the time of declaring it.
Here is an example, that adds the default value to a name parameter:
function enterYourname(name="Unknown"){ return 'User name is '+ name } console.log(enterYourname()); 
Second example:
function addFive(a,b=5){ return a+b; } console.log(addFive(1));Output:
6