References

Array.at()

Array.concat()

Array.copyWithin()

Object.defineProperties()

Object.defineProperty()

Object.entries()

Object.freeze()

Object.fromEntries()

Object.getOwnPropertyDescriptor()

Object.getOwnPropertyDescriptors()

Object.getOwnPropertyNames()

Object.getOwnPropertySymbols()

Object.getPrototypeOf()

Object.hasOwn()

Object.hasOwnProperty()

Object.is()

Object.isExtensible()

Object.isFrozen()

Object.isPrototypeOf()

Object.isSealed()

Object.keys()

Object.preventExtensions()

Object.seal()

Object.setPrototypeOf()

Object.toLocaleString()

String.fromCodePoint()

String.includes()

String.indexOf()

String.lastIndexOf()

String.localeCompare()

String.toLocaleLowerCase()

String.toLocaleUpperCase()

Array.unshift()

Leírás

Új elemet szúr be az Array példány elejére.

Szintaxis

unshift()
unshift(element1)
unshift(element1, element2)
unshift(element1, element2, /* …, */ elementN)

Példa

const array1 = [1, 2, 3]
 
console.log(array1.unshift(4, 5))
// Expected output: 5
 
console.log(array1)
// Expected output: Array [4, 5, 1, 2, 3]

in this article

Leírás
Szintaxis
Példa