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Rediscovering JavaScript: ES6, ES7 & ES8

Using the Rest Parameter and Default Arguments

Explore how to implement rest parameters and default arguments within arrow functions in JavaScript. This lesson helps you understand syntax rules including parentheses usage, enabling you to write more flexible functions that handle multiple or optional inputs efficiently.

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Using the rest parameter

In the Using the Rest Parameter lesson, we saw how functions can take a rest parameter. Arrow functions’ parameters can also have a rest parameter.

Let’s create an arrow function, greet(), that takes multiple subjects.

Javascript (babel-node)
'use strict';
//START:CODE
const greet = 
  (message, ...subjects) => console.log(message + ' '+ subjects.join(', '));
greet('Hi', 'Developers', 'Geeks');
//END:CODE

Explanation

  • The function takes two parameters: ...