80 lines
2.8 KiB
JavaScript
80 lines
2.8 KiB
JavaScript
// All valid credit card numbers
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const valid1 = [4, 5, 3, 9, 6, 7, 7, 9, 0, 8, 0, 1, 6, 8, 0, 8];
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const valid2 = [5, 5, 3, 5, 7, 6, 6, 7, 6, 8, 7, 5, 1, 4, 3, 9];
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const valid3 = [3, 7, 1, 6, 1, 2, 0, 1, 9, 9, 8, 5, 2, 3, 6];
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const valid4 = [6, 0, 1, 1, 1, 4, 4, 3, 4, 0, 6, 8, 2, 9, 0, 5];
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const valid5 = [4, 5, 3, 9, 4, 0, 4, 9, 6, 7, 8, 6, 9, 6, 6, 6];
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// All invalid credit card numbers
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const invalid1 = [4, 5, 3, 2, 7, 7, 8, 7, 7, 1, 0, 9, 1, 7, 9, 5];
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const invalid2 = [5, 7, 9, 5, 5, 9, 3, 3, 9, 2, 1, 3, 4, 6, 4, 3];
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const invalid3 = [3, 7, 5, 7, 9, 6, 0, 8, 4, 4, 5, 9, 9, 1, 4];
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const invalid4 = [6, 0, 1, 1, 1, 2, 7, 9, 6, 1, 7, 7, 7, 9, 3, 5];
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const invalid5 = [5, 3, 8, 2, 0, 1, 9, 7, 7, 2, 8, 8, 3, 8, 5, 4];
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// Can be either valid or invalid
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const mystery1 = [3, 4, 4, 8, 0, 1, 9, 6, 8, 3, 0, 5, 4, 1, 4];
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const mystery2 = [5, 4, 6, 6, 1, 0, 0, 8, 6, 1, 6, 2, 0, 2, 3, 9];
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const mystery3 = [6, 0, 1, 1, 3, 7, 7, 0, 2, 0, 9, 6, 2, 6, 5, 6, 2, 0, 3];
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const mystery4 = [4, 9, 2, 9, 8, 7, 7, 1, 6, 9, 2, 1, 7, 0, 9, 3];
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const mystery5 = [4, 9, 1, 3, 5, 4, 0, 4, 6, 3, 0, 7, 2, 5, 2, 3];
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// An array of all the arrays above
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const batch = [valid1, valid2, valid3, valid4, valid5, invalid1, invalid2, invalid3, invalid4, invalid5, mystery1, mystery2, mystery3, mystery4, mystery5];
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// Add your functions below:
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function validateCred(array) {
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let newArray = [];
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let cardIssuer = "";
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switch (array[0]) {
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case 3 :
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cardIssuer = "American Express";
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break;
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case 4 :
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cardIssuer = "Visa";
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break;
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case 5 :
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cardIssuer = "Mastercard";
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break;
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case 6 :
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cardIssuer = "Discover";
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break;
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default :
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cardIssuer = "[UNKNOWN]";
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break;
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}
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for (let i = array.length - 1; i >= 0; i--) {
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let currentPlace = array[i];
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// to see if the [i] is an even number in the array - so that the 2nd, 4th, 6th element of the array etc - and if so => Double the number
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if (i % 2 !== 0) {
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newArray.push(currentPlace);
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continue;
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}
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// if the double of the number is superior to 9, take the sum of the two numbers. Which is equivalent to substracting 9 to it curriously
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if (currentPlace * 2 > 9) {
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let twoNum = currentPlace * 2 - 9;
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newArray.push(twoNum);
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} else {
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newArray.push(currentPlace * 2);
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}
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// add all the numbers
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}
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const sumUp = newArray.reduce((accumulator, currentValue) => accumulator + currentValue);
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const isValid = sumUp % 10 === 0;
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const cardID = `${array.at(0)}${array.at(1)}${array.at(2)}X-XXXX-XXXX-X${array.at(-3)}${array.at(-2)}${array.at(-1)}`;
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console.log(`The credit card ${cardID} is issued by ${cardIssuer}.
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It is ${isValid ? "a VALID" : "an INVALID"} credit card.
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----------`);
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return isValid;
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}
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function findInvalidCards(nestedArray) {
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for (const array of nestedArray) {
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validateCred(array);
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}
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}
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findInvalidCards(batch); |