Converts a float (like 1.5) to an hour (1h30)

floatToHour.js

/**
 * Will convert any float (pos or neg) to an hour value
 * floatToHour(1.5) will return "1h30"
 * 
 * @param {number}
 * @returns {string}
 */
function floatToHour(num) {
    var sign = num >= 0 ? 1 : -1;

    // Get positive value of num
    num *= sign;

    // Separate the int from the decimal part
    var intPart = Math.floor(num);
    var decPart = num - intPart;

    var minutes = Math.floor(decPart * 60);

    // Sign result
    sign = sign == 1 ? '' : '-';

    // pad() adds a leading zero if needed
    return sign + intPart + 'h' + pad(minutes, 2);
}

/**
 * Will add leading zeroes to any number to output a string with desired length
 * pad(25, 3) will return "025"
 *
 * @param number
 * @param length
 * @returns {string}
 */
function pad(number, length) {
    var str = '' + number;
    while (str.length < length) {
        str = '0' + str;
    }
    return str;
}