Built-in Objects at a Glance

The global environment ships with the commonly used objects of modern JS — no import needed:

Category	Objects
Fundamentals	Object Array String Number Boolean Symbol BigInt Math JSON RegExp
Collections	Map Set WeakMap WeakSet
Metaprogramming	Proxy Reflect Iterator
Async	Promise
Binary	ArrayBuffer DataView and the TypedArray family
Weak references	WeakRef FinalizationRegistry
Errors	The full error type family (TypeError / RangeError / SyntaxError / ReferenceError …)
Date & time	Temporal — the modern date/time API that replaces Date

console.log([1, 2, 3].filter(v => v > 1).reduce((a, b) => a + b))  // → 5
console.log(Math.hypot(3, 4))                                       // → 5
console.log(JSON.stringify({ ok: true }, null, 2))

let m = new Map([["a", 1]])
m.set("b", 2)
console.log([...m.keys()])                                          // → [a, b]

For the complete list (including the methods available on each object), see the API Reference §3.