JavascriptBlog.

References

Array.copyWithin()

Array.findIndex()

Array.flatMap()

Array.forEach()

Array.includes()

Array.indexOf()

Array.isArray()

Array.lastIndexOf()

Array.reduceRight()

Array.reverse()

Array.toString()

Array.unshift()

Function.toString()

JSON.stringify()

Object.assign()

Object.create()

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.isExtensible()

Object.isFrozen()

Object.isPrototypeOf()

Object.isSealed()

Object.preventExtensions()

Object.setPrototypeOf()

Object.toLocaleString()

Object.values()

Promise.allSettled()

Promise.finally()

String.charAt()

String.charCodeAt()

String.concat()

String.endsWith()

String.fromCodePoint()

String.includes()

String.indexOf()

String.lastIndexOf()

String.localeCompare()

String.matchAll()

String.padEnd()

String.padStart()

String.replace()

String.replaceAll()

String.search()

String.startsWith()

String.substring()

String.toLocaleLowerCase()

String.toLocaleUpperCase()

String.toLowerCase()

String.toString()

String.toUpperCase()

String.trimEnd()

String.trimStart()

String.valueOf()

Symbol.keyFor()

String.includes()

Leírás

let x = 'Javascript'
 
console.log(x.includes('ipt', 4))
// Expected output: false

A 4 indextől kezdve az "ipt" szöveget tartalmazz az adott karakterláncot.

console.log(x.includes('ipt'))
// Expected output: true

Szintaxis

includes(searchString)
includes(searchString, position)

Példa

const sentence = 'The quick brown fox jumps over the lazy dog.'
const word = 'fox'
 
console.log(`The word "${word}" ${sentence.includes(word) ? 'is' : 'is not'} in the sentence`)
// Expected output: "The word "fox" is in the sentence"

in this article

Leírás
Szintaxis
Példa

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