text-javascript.js

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// Taken from https://en.wikipedia.org/wiki/JavaScript

// Declares a function-scoped variable named `x`, and implicitly assigns the

// special value `undefined` to it. Variables without value are automatically

// set to undefined.

var x;

// Variables can be manually set to `undefined` like so

var x2 = undefined;

// Declares a block-scoped variable named `y`, and implicitly sets it to

// `undefined`. The `let` keyword was introduced in ECMAScript 2015.

let y;

// Declares a block-scoped, un-reassignable variable named `z`, and sets it to

// a string literal. The `const` keyword was also introduced in ECMAScript 2015,

// and must be explicitly assigned to.

// The keyword `const` means constant, hence the variable cannot be reassigned

// as the value is `constant`.

const z = "this value cannot be reassigned!";

// Declares a variable named `myNumber`, and assigns a number literal (the value

// `2`) to it.

let myNumber = 2;

// Reassigns `myNumber`, setting it to a string literal (the value `"foo"`).

// JavaScript is a dynamically-typed language, so this is legal.

myNumber = "foo";

const target = "foo";