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?'

Example 3: variable defaults javascript es6

let variableToSet = checkedValue || defaultValue;

Example 4: default value of functin atribute

function say(message='Hi', number=7) {
    console.log(message);
  	console.log(number);
}

say();
// 'Hi'
// 7