Example 1: javascript indexof
//indexOf getting index of array element, returns -1 if not found
var movies=["tamilrokers","bolly4u","okhatrimaza"];
var pos=movies.indexOf("okhatrimaza");//2
//indexOf getting index of sub string, returns -1 if not found
var content = "We got a poop cleanup on isle 4.";
var strPos = content.indexOf("poop");//9
Example 2:
//indexOf - JS method to get index of array element.
// Returns -1 if not found
var movies=["tamilrokers","bolly4u","okhatrimaza"];
var pos=movies.indexOf("okhatrimaza");//2
//indexOf getting index of sub string, returns -1 if not found
var content = "We got a poop cleanup on isle 4.";
var strPos = content.indexOf("poop");//9
//Eg with material ui
<Checkbox
checked={value.indexOf(option) > -1}
value={option}
/>
Example 3:
Array.indexOf(searchElement, fromIndex)
Example 4: .index of javascript
let upCommingMovies = ['tamilrokers', '4cgandhi','khatrimaza', 'bolly4u'] ;
console.log(upCommingMovies.indexOf('khatrimaza')) ;
I hope you get an idea about javascript split.