10/16/22 JavaScript on Your Machine Lab - Jinseok

index.js

@@ -4,7 +4,66 @@
  * Depending on the operation, either add up all of the numbers or subtract all of the numbers, from left to right.
  * @returns {number} The result of either adding all numbers or subtracting all numbers, depending on the arguments added to the command line.
  */
-function calculator() {}
+// CLEAN CODE:
+function calculator() {
+ // assigning the operation if there's any
+ const command = process.argv[2];
+ // assigning the first number if there's number
+ const number = process.argv[3];
+ //converting the String type of number to the Number type
+ let result = Number(number);
+
+ // if there's no operation
+ if (command === undefined) {
+ return "No operation provided...";
+ // if there's no number
+ } else if (number === undefined) {
+ return "No numbers provided...";
+ }
+ // looping from second number,
+ // because the first number is assigned to the variable result
+ for (let i = 4; i < process.argv.length; i++) {
+ if (command === 'plus') {
+ // adding to the first number
+ result += Number(process.argv[i]);
+ } else if (command === 'minus') {
+ // subtracting the first number
+ result -= Number(process.argv[i]);
+ } else {
+ // if the operation is not plus or minus
+ return `Invalid operation: ${command}`;
+ }
+ }
+ // return the total value;
+ return result;
+}
+
+
+// // MESSY CODE:
+// let result = 0;
+// function calculator() {
+// if (process.argv[2] === undefined) {
+// return "No operation provided...";
+// } else if (process.argv[3] === undefined) {
+// return "No numbers provided...";
+// } else {
+// let arr = [];
+// for (let i = 3; i < process.argv.length; i++) {
+// arr.push(parseInt(process.argv[i]));
+// }
+// for (let i = 0; i < arr.length; i++) {
+// if (process.argv[2] === 'plus') {
+// result = arr.reduce((a, b) => a + b);
+// } else if (process.argv[2] === 'minus') {
+// result = arr.reduce((a, b) => a - b);
+// } else {
+// return `Invalid operation: ${process.argv[2]}`;
+// }
+// }
+// }
+// return result;
+// }
+
 
 // Don't change anything below this line.
 module.exports = calculator;