Question

write a javascript function called cal_modes that will take a List of numbers or strings as input and returns a List of the most frequent values. If there's only one most-frequent value, it returns a single-element List.

example

cal_modes([3,4,5,5]) should return [5]

cal_modes([8.9, 1, 1]) should return [1]

cal_modes([2.5, -2, -2, 2.5]) should return [2.5]

cal_modes([3,3,4,4]) should return [3,4]

cal_modes([3,4,5]) should return [3,4,5], because all occur with equal frequency

cal_modes(["hi", "what", "where", "hi"]) should return ["hi”]

Answer 1

function cal_modes(list) {
    var result = [];
    var maxCount = 0;
    for (var i = 0; i < list.length; i++) {
        var count = 0;
        for (var j = 0; j < list.length; j++) {
            if (list[i] === list[j]) {
                count++;
            }
        }
        if (count > maxCount) {
            maxCount = count;
        }
    }
    for (var i = 0; i < list.length; i++) {
         var count = 0;
        for (var j = 0; j < list.length; j++) {
            if (list[i] === list[j]) {
                count++;
            }
        }
        if (count === maxCount) {
            var found = false;
            for (var k = 0; k < result.length; k++) {
                if (result[k] === list[i]) {
                    found = true;
                } 
            }
            if (!found)
                result.push(list[i]);
        }
    }
    return result;
}

console.log(cal_modes([3,4,5,5]));
console.log(cal_modes([8.9, 1, 1]));
console.log(cal_modes([2.5, -2, -2, 2.5]));
console.log(cal_modes([3,3,4,4]));
console.log(cal_modes([3,4,5]));
console.log(cal_modes(["hi", "what", "where", "hi"]));