arrow_functions_intro.js

// This is a regular function
function addTwoNumbers(x, y) {
	return (x + y);
}

// This is an arrow function
// There's an important syntactical difference to note:
// The arrow functions use the => instead of the "function" keyword.
const addTwoNumbers = (x, y) => x + y;

// Writing a multi-line arrow function
const isEven = (number) => {
	return (number % 2  == 0) ? true : false;
}

// Some arrow functions have parentheses around the parameters and others don't.

// With parentheses
const substractNumbers = (x, y) => x - y;

// Without parentheses
const squareNumber = x => x^2;

// An arrow function with no parameters needs parentheses.
const sayHi = () => alert('Hey There!');

// An arrow function with only one parameter does not need parentheses.
const squareNumber = x => x^2;