JavaScript: the Global Object

JavaScript the language defines a global object.

Purpose of Global Object

Global object holds all variable/object/function of the JavaScript language as properties.

Value of Global Object

What object is the Global Object depends on the language host.

In web browser, the Global Object is window. [see Browser Window Object]

In Deno, the Global Object is window.

In node.js, the Global Object is global. [see Node.js Tutorial]

globalThis

globalThis (JS2020) is a variable that is alias to the Global Object.

console.log( globalThis === window); // true in browser

Constant Literals

• Infinity
• NaN
• undefined

Simple Functions

• eval
• isFinite
• isNaN
• parseInt
• parseFloat
• encodeURI / decodeURI
• encodeURIComponent / decodeURIComponent
• escape / unescape

Static Objects

• JSON
• Math
• Reflect 🌟

Primitive Wrapper

• Number
• Boolean
• String

Special Objects

• Object
• Array
• Function
• RegExp
• Date
• Set 🌟
• Map 🌟
• Symbol 🌟
• WeakSet
• WeakMap
• Proxy
• Promise

Error Objects

• Error
• EvalError
• RangeError
• ReferenceError
• SyntaxError
• TypeError
• URIError

Misc

• DataView
• ArrayBuffer
• Float32Array
• Float64Array
• Int8Array
• Int16Array
• Int32Array
• Uint8Array
• Uint8ClampedArray
• Uint16Array
• Uint32Array