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()

String.indexOf()

Leírás

Visszatér a String példány azon indexével, ahol először előfordul (kezdődik) az argumentumba írt string.

Szintaxis

indexOf(searchString)
indexOf(searchString, position)

Példa

const paragraph = 'Javascript'
 
console.log(paragraph.indexOf('t'))
// Expected output: 9
 
const paragraph2 = 'TechOnTheNet'
 
console.log(paragraph2.indexOf('T', 4))
// Expected output: 6

in this article

Leírás
Szintaxis
Példa