lastIndexOf
Pagpapaliwanag
Hahanapin niyalang yung "pinakahuling" 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
First Argument - yung string na gusto mong kunin yung hulihan niyang index
const x = "hello my dog name is dog";
console.log(x.lastIndexOf("my")); // 6
console.log(x.lastIndexOf("o")); // 22
console.log(x.lastIndexOf("wolf")); // -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.lastIndexOf("hello", 0)); // 0
// Searching sa 'ello my dog name is dog'
console.log(x.lastIndexOf("hello", 1)); // 0
// Searching sa 'llo my dog name is dog'
console.log(x.lastIndexOf("llo", 2)); // 2
// Searching sa 'hello my dog name is dog'
console.log(x.lastIndexOf("llo")); // 2
comparison sa lastIndexOf
const x = "hello my dog name is dog";
console.log(x.indexOf("dog")); // 9
console.log(x.lastIndexOf("dog")); // 21