Implementation of JavaScript indexOf() method

Took 3 minutes 37 seconds to code JavaScript indexOf() method. Here is the code snippet.

Code:

arr = ['1', '2', '3'];

function indexOf(arr, element) {

for (var i = 0; i < arr.length; i++) {

if (element === arr[i]) {

return i;

}

}

return -1;

}

document.write(indexOf(arr, '3'));

Result:

2