syntax - functions - statements - ex - js advanced

function calcFruits(fruit, weight, money) { // weight in grams
    const weightInKG = weight/1000;
    const moneyNeeded = weightInKG * money;

    console.log(`I need $${moneyNeeded.toFixed(2)} to buy ${weightInKG.toFixed(2)} kilograms ${fruit}.`)
}

function gcd(a, b) {
    while (b != 0) {
        const temp = b;
        b = a % b;
        a = temp;
    }

    return a;
}

function extractNumbers(intNum) {
    const strNum = intNum.toString();
    let result = parseInt(strNum[0]);
    let isSame = true;

    for (let i = 1; i < strNum.length; i++) {
        result += parseInt(strNum[i]);

        if (strNum[i] != strNum[i-1]) {
            isSame = false;
        }
    }

    console.log(isSame);
    console.log(result);
}



function previousDate (year, month, day) {
    const date = new Date(year, month, day);

    console.log("first", date.getFullYear(), date.getMonth(), date.getDate());
    const millisecs = 1000 * 60 * 60 * 24;
    date.setDate(date.getDate() - 1);
    console.log("result", date.getFullYear() +  "-" + date.getMonth() + "-" + date.getDate());

    // let dateString = year + '-' + month + '-' + day;
    // let event = new Date(dateString);
    // event.setDate(day-1);
    // console.log(event.getFullYear()+`-` + (Number(event.getMonth()) + 1)+ '-' + event.getDate());
}


function speedRestriction(speed, area) {
    let motorwaySpeed = 130;
    let interstateSpeed = 90;
    let citySpeed = 50;
    let residentialSpeed = 20;

    let difference = 0;
    let speedZone = 0;
    let overLimit = "";


    switch (area) {  // area == "motorway" > do smth... else if (area == "interstate") ....
        case "motorway":
            speedZone = motorwaySpeed;
            break;
        case "interstate":
            speedZone = interstateSpeed;
            break;
        case "city":
            speedZone = citySpeed;
            break;
        case "residential":
            speedZone = residentialSpeed;
            break;
    }

    if (speed > speedZone) {
        difference = speed - speedZone;
    }

    if (difference > 0) {
        if (difference <= 20) {
            overLimit = "speeding";
        } else if (difference <= 40) {
            overLimit = "excessive speeding";
        } else {
            overLimit = "reckless driving"
        }

        console.log(`The speed is ${difference} km/h faster than the allowed speed of ${speedZone} - ${overLimit}`)
    } else {
        console.log(`Driving ${speed} km/h in a ${speedZone} zone`);
    }
}



function cooking (num, op1, op2, op3, op4, op5) {
    num = Number(num);

    let chop = function(n) {
        return n/2;
    }
    let dice = function(n) {
        return Math.sqrt(n);
    }
    let spice = function(n) {
        return n+1;
    }
    let bake = function(n) {
        return n*3;
    }
    let fillet = function(n) {
        return n * 0.8;
    }

    const arr = [op1, op2, op3, op4, op5];
    let result = num;

    for (let i = 0; i < arr.length; i++) {
        switch (arr[i]) {
            case "chop":
                result = chop(result);
                console.log(result);
                break;
            case "dice":
                result = dice(result);
                console.log(result);
                break;
            case "spice":
                result = spice(result);
                console.log(result);
                break;
            case "bake":
                result = bake(result);
                console.log(result);
                break;
            case "fillet":
                result = fillet(result);
                console.log(result);
                break;
        }
    }
}