Default Parameters in JavaScript

You can assign default values to function parameters. If an argument is not provided, the default value will be used.

defaultParameters.js

function greetUser(name = "Guest") {
    console.log("Hello, " + name + "!");
}

greetUser("Alice");
greetUser();

 

Output

Hello, Alice!
Hello, Guest!

function greetUser(name = "Guest") {
    console.log("Hello, " + name + "!");
}

 

The parameter name is given a default value of "Guest". This means if no argument is passed to the function when it's called, name will automatically be assigned the value "Guest".

 

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