Ano ngaba ang String indexOf method sa Javascript?
Yung indexOf method sa javascript is hahanapin niyalang yung pinakaunang occurence ng string na binigay mo as an argument tapos re-return value niya yung index nung string nayon.

if wala siyang nakita re-return niya is -1

tignan niyo nalang pics if hindi niyo masyado maintindihan.

Pano gamitin:
First Argument - yung string na gusto mong kunin yung unahan niyang index

const x = 'hello my dog name is dog'

console.log( x.indexOf('my')  ) // 6
console.log( x.indexOf('o')   ) // 4
console.log( x.indexOf('cat') ) // -1

Second Argument (optional) - kung sang index siya mag-uumpisa mag search (default is 0 which is yung start ng string)

const x = 'hello my dog name is dog'

// Searching sa 'hello my dog name is dog'
console.log( x.indexOf('hello',0) ) // 0 

// Searching sa 'ello my dog name is dog'
console.log( x.indexOf('hello',1) ) // -1

// Searching sa 'llo my dog name is dog'
console.log( x.indexOf('llo',2) ) // 2

// Searching sa 'hello my dog name is dog'
console.log( x.indexOf('llo') ) // 2

What if dalawa occurences sino kukunin niyang index?

const x = 'hello my dog name is dog'

console.log( x.indexOf('dog') ) // 9

console.log( x.lastIndexOf('dog') ) // 21

kukunin niya yung index ng pinakaunang occurence which is 9,
kung gusto mo kunin yung index ng last occurence gamitin mong method is lastIndexOf

More tagalog Javascript Learning Resources:
https://javascript-methods-in-tagalog.vercel.app/