Write a function that takes two strings, and returns the index of the first occurrence of one string in the other.

index-of.js

// Write a function that takes two strings, and returns the index of the first occurrence of one string in the other
// Do not use built-in functions: indexOf, substr, substring, array.split

function indexof(strToFind, str) {
    var len1 = str.length;
    var len2 = strToFind.length;
    var i, j, numCorrect;
    
    for (i=0; i<len1; i++) {
        numCorrect = 0;
        for (j=0; j<len2; j++) {
            if (str.charAt(i+j) === strToFind.charAt(j)) {
                numCorrect += 1;
            }
        }
        if (numCorrect === len2) {
            return i;
        }
    }
}