我正在嘗試使用我的 validateCred() 函式，它可以檢查信用卡陣列并回傳有效或無效并且作業正常。還有一個包含所有陣列的批處理陣列。問題是，在我的 findInvlaidCards() 函式內部，當我在 findInvalidCards() 函式的 for 回圈中回圈批處理陣列后，我想在 if 陳述句中使用 validateCred() 方法時，它將陣列轉換為不同的陣列。檢查 findInvalidCred() 中的 if 陳述句，我添加了一條注釋，其中包含我得到的輸出。請幫助并盡可能地解釋它。
// All invalid credit card numbers
const invalid1 = [4, 5, 3, 2, 7, 7, 8, 7, 7, 1, 0, 9, 1, 7, 9, 5];
const invalid2 = [5, 7, 9, 5, 5, 9, 3, 3, 9, 2, 1, 3, 4, 6, 4, 3];
const invalid3 = [3, 7, 5, 7, 9, 6, 0, 8, 4, 4, 5, 9, 9, 1, 4];
const invalid4 = [6, 0, 1, 1, 1, 2, 7, 9, 6, 1, 7, 7, 7, 9, 3, 5];
const invalid5 = [5, 3, 8, 2, 0, 1, 9, 7, 7, 2, 8, 8, 3, 8, 5, 4];
const invalid6 = [3, 7, 1, 6, 1, 2, 0, 1, 9, 9, 8, 5, 2, 3, 6];
// Can be either valid or invalid
const mystery1 = [3, 4, 4, 8, 0, 1, 9, 6, 8, 3, 0, 5, 4, 1, 4];
const mystery2 = [5, 4, 6, 6, 1, 0, 0, 8, 6, 1, 6, 2, 0, 2, 3, 9];
const mystery3 = [6, 0, 1, 1, 3, 7, 7, 0, 2, 0, 9, 6, 2, 6, 5, 6, 2, 0, 3];
const mystery4 = [4, 9, 2, 9, 8, 7, 7, 1, 6, 9, 2, 1, 7, 0, 9, 3];
const mystery5 = [4, 9, 1, 3, 5, 4, 0, 4, 6, 3, 0, 7, 2, 5, 2, 3];
// An array of all the arrays above
const batch = [valid1, valid2, valid3, valid4, invalid1, invalid2, invalid3, invalid4,
invalid5, invalid6, mystery1, mystery2, mystery3, mystery4, mystery5];
// Add your functions below:
function validateCred(arr){
let sum = 0;
for (let i = arr.length - 1; i >= 0; i--) {
if(i % 2 == 0){
arr[i] *= 2;
if(arr[i] > 9){
arr[i] -= 9;
}
sum = arr[i];
} else {
sum = arr[i];
}
}
if (sum % 10 == 0){
return "Invalid";
} else {
return "Valid";
}
}
function findInvalidCards(array){
const invalidArrays = [];
for(let i = 0; i < array.length; i ){
//console.log(array[i]);
if(validateCred(array[i]) == "Invalid"){
console.log(array[i]);
/* this if statment returns these arrays which are not what i have
[ 8, 5, 6, 9, 3, 7, 5, 9, 0, 8, 0, 1, 3, 8, 0, 8 ]
[ 1, 5, 6, 5, 5, 6, 3, 7, 3, 8, 5, 5, 2, 4, 6, 9 ]
[ 3, 0, 2, 1, 2, 4, 8, 3, 8, 0, 3, 8, 4, 9, 0, 5 ]
[ 8, 5, 6, 9, 8, 0, 8, 9, 3, 7, 7, 6, 9, 6, 3, 6 ]
[ 1, 4, 3, 6, 2, 0, 0, 8, 3, 1, 3, 2, 0, 2, 6, 9 ]
[ 3, 0, 2, 1, 6, 7, 5, 0, 4, 0, 9, 6, 4, 6, 1, 6, 4, 0, 6 ]
[ 8, 9, 2, 3, 1, 4, 0, 4, 3, 3, 0, 7, 4, 5, 4, 3 ]*/
invalidArrays.push(array[i]);
}
}
//console.log(invalidArrays)
return invalidArrays;
}
findInvalidCards(batch);
uj5u.com熱心網友回復：
您正在更改 validateCred 函式中的原始陣列。您可以改為將陣列元素值存盤在一個變數中，然后對其進行任何您想要的操作。
function validateCred(arr) {
let sum = 0
let currentNumber
for (let i = arr.length - 1; i >= 0; i--) {
currentNumber = arr[i]
if (i % 2 == 0) {
currentNumber *= 2
if (currentNumber > 9) {
currentNumber -= 9
}
}
sum = currentNumber
}
if (sum % 10 == 0) {
return 'Invalid'
} else {
return 'Valid'
}
}
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標籤：javascript 数组 循环 迭代
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