Just js

function count(number) 
{
    if (number) {
        if (Number.isInteger(number)) {
            let counted = 1;
            const numberPlus1 = number + 1;
                for (counted;counted<numberPlus1;counted++) 
                {
                    console.log(counted);
                }
        }
        else { 
            console.log(number + ' is not a number');
        }
    }
}
function isNumberEven(number) 
{
    if (Number.isInteger(number)) {
        if (number % 2 == 0)
        {
            console.log(number + ' is even');
        }
        else
        {
            console.log(number + ' is odd');
        }
    }
    else {
        console.log(number + ' is not a number');
    }
}
function strings(string, type) {
    if (string) {
        if (type) {
            if (type==='Capitalized') {
                console.log(string.substring(0,1).toUpperCase()+string.substring(1,string.length).toLowerCase());
            }
            if (type==='AllCaps') {
                console.log(string.toUpperCase());
            }
            if (type==='AllLower') {
                console.log(string.toLowerCase());
            }
        }
    }
}

count(5);
isNumberEven(15);
isNumberEven(16);
const string = 'JoHn';
console.log(string);
strings(string, 'Capitalized');
strings(string, 'AllCaps');
strings(string, 'AllLower');