create function with default values javascript code example

Example 1: javascript default parameters

function multiply(a, b = 1) {
  return a * b;
}

Example 2: default in javascript

const greet = (message = 'Hello World!') => console.log(message);

greet(); // prints 'Hello World!'
greet('Hello! Does this answer your question?') // prints 'Hello! Does this answer your question?'