Question

How to use indexOf in JavaScript

Answer 1

const s = "javascript";

let i = s.indexOf("j");
console.log(i);

i = s.indexOf("a");
console.log(i);

i = s.indexOf("z");
console.log(i);




/*

run:

0
1
-1

*/

 

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Answer 2

const s = "javascript c++ php javascript" 

let i = s.indexOf("javascript");
console.log(i);

i = s.indexOf("javascript", 5); // Find the word beginning at index 5
console.log(i);



/*

run:

0
19

*/

 

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