Challenge: Binary search(Khan Academy)

Solução para o problema de busca binária no Khan Academy:

/* Returns either the index of the location in the array,
  or -1 if the array did not contain the targetValue */
var doSearch = function(array, targetValue) {
    var min = 0;
    var max = array.length - 1;
    var guess, count = 0;
    while(min <= max){
        guess = Math.floor((min+max)/2);
        println(guess);
        count++;
        if(array[guess] === targetValue){ 
            println(count);
            return guess; 
        }
        else if(array[guess]<targetValue){
            min=guess+1;
        }
        else{ 
            max = guess-1;
        }
    }
    return -1;
};

var primes = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 
		41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97];

var result = doSearch(primes, 970);
println("Found prime at index " + result);
Program.assertEqual(doSearch(primes, 73), 20);
Program.assertEqual(doSearch(primes, 2), 0);
Program.assertEqual(doSearch(primes, 97), 24);