자바스크립트 예제

자바스크립트를 이용해

1)음식값을 입력받고

2)음식의 가격범주에 따라 팁을 정하고

3)음식값과 팁을 합쳐

4)각각의 총합 (총 음식값, 총 팁, 음식과 팁을 합친 값의 총계)를 보여주는 예제를 만들어 보았다.

Udemy - The Complete JavaScript Course 2020 : Build Real Projects!과정의 Challenge3 과정이다. 아래 코드에 문제와 내가 해결한 답을 모두 적었다.

/*****************************
* CODING CHALLENGE 3
*/

/*
John and his family went on a holiday and went to 3 different restaurants. 
The bills were $124, $48 and $268.
To tip the waiter a fair amount, John created a simple tip calculator (as a function). 
He likes to tip 20% of the bill when the bill is less than $50, 
15% when the bill is between $50 and $200, 
and 10% if the bill is more than $200.
In the end, John would like to have 2 arrays:
1) Containing all three tips (one for each bill)
2) Containing all three final paid amounts (bill + tip).
(NOTE: To calculate 20% of a value, simply multiply it with 20/100 = 0.2)
GOOD LUCK 😀
*/

function tipRateCalculator(bill){
    var tipRate;
    
    console.log("tipRateCalculator - bill : ",bill);
    

    switch(true){
        case bill >= 0 && bill<50 :
            return tipRate = 0.2;
        case bill >= 50 && bill < 200 :
            return tipRate = 0.15;
        case bill >=200 :
            return tipRate = 0.1;
    }
}

function tipCalculator(bill){    
    var tip = bill*tipRateCalculator(bill);
    
    return tip;
}

function makeTotalBillArray(){
    var totalBillArray = new Array;
    do{
        var billQ = parseInt(prompt("please insert bill")); 
        
        totalBillArray.push(billQ);
        var question = confirm('Continue?');
    }while(question);

    return totalBillArray;
}

function makeTipArray(billArray){
    var tipArray = new Array;

    billArray.forEach(bill => {
        var tip = tipCalculator(bill);
        tipArray.push(tip);
    });

    return tipArray;
}

function billAddTip(billArray, tipArray){
    var calculateBillArray = new Array;
    for(var i = 0; i < billArray.length; i++){
        var added = billArray[i] + tipArray[i];
        calculateBillArray.push(added);
    }
    return calculateBillArray;
}

function makeCalculatedBillArray(){
    var totalBillArray = makeTotalBillArray();
    var tipArray = makeTipArray(totalBillArray);
    var calculateBillArray = billAddTip(totalBillArray,tipArray);

    var totalArray = new Array;
    totalArray.push(totalBillArray);
    totalArray.push(tipArray);
    totalArray.push(calculateBillArray);

    return totalArray;
}

function makeTotal(array){
    console.log("makeTotal",array);
    
    var total = new Number;
    array.forEach(element => {
        console.log(element);
        total += element;
    });    
    return total;
}

function staticsOfTotal(){
    var totalArray = makeCalculatedBillArray();
    var totalBill = makeTotal(totalArray[0]);
    var totalTip = makeTotal(totalArray[1]);
    var total = makeTotal(totalArray[2]);

    alert(`total Bill = ${totalBill}`);
    alert(`total Tip = ${totalTip}`);
    alert(`total = ${total}`);
}

staticsOfTotal();

 

참조 : Udemy - The Complete JavaScript Course 2020 : Build Real Projects!