Getting Started with JavaScript

getting-started-with-javascript.markdown

Getting Started with JavaScript

A Pen by Shigeru Kobayashi on CodePen.

License.

script.js

// A "hello world" example
console.log("Hello world!");

// Operators
console.log(600 + 150);
console.log(2018 - 1970);
console.log(500 * 1.08);
console.log(1480 / 2);

// Variables
let price = 100;
let taxRate = 0.08;
let priceIncludingTax = price * (1 + taxRate);
console.log(priceIncludingTax);

// Arrays
let dayOfTheWeek = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"];

// Print the first (0th) element
console.log(dayOfTheWeek[0]);

// Print the length of the array
console.log(dayOfTheWeek.length);

// Conditionals
const age = 16;
const adultAge = 20;

if (age < adultAge) {
  console.log("Child");
} else {
  console.log("Adult");
}

// Loops
// A counter, an exit condition, an iterator
for (let i = 0; i < dayOfTheWeek.length; i++) {
  console.log(dayOfTheWeek[i]);
}

// Functions
// The name of the function, a list of parameters, the JavaScript statements that define the function
function calculateTaxIncludedPrice(price) {
  const taxRate = 0.05;
  return Math.floor(price * (1 + taxRate));
}

console.log(calculateTaxIncludedPrice(980));

// Property accessors
const player1 = { name: "Parzival", realName: "Wade Owen Watts", age: 18 };
console.log(player1["name"]);