Tea bitterness calculator

tea.js

/**
* tea_serving is a Natural number.
* 1 represents 1 teaspoon
* water_temperature is in degrees
* tea_type is of enum TEA_TYPE
* steeping time is in minutes
*/
function bitterness(tea_serving, water_temperature, tea_type, steeping_time) {
    let tooHotBitternessMultiplier = 1;
    let teaTypeGroundBitterness = 1;
    if (teaIsLight(tea_type)) {
        teaTypeGroundBitterness = 1;
    } else if (teaIsDark(tea_type)) {
        teaTypeGroundBitterness = 1.5;
    }
    if (!waterTemperatureIsRightForTea(tea_type, water_temperature)) {
        tooHotBiternessMultiplier = 1.5;
    }

    return steeping_time * Math.max(0.5, tea_serving) * tooHotBiternessMultiplier * teaTypeGroundBitterness;
}