var doSearch = function(array, targetValue) {
    var min = 0;
    var max = array.length - 1;
    var guess;
    while(max >= min){
        guess = (max+min)/2;
        print(guess);
        guess = Math.floor(guess);
        //guess = guess | 0;
        if(array[guess] === targetValue){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, 73);
print("Found prime at index " + result);
 
 

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