javascript on your machine lab

index.js

@@ -4,7 +4,92 @@
  * 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() {}
+function calculator() {
+
+    console.log(process.argv[2])
+
+    let operation = process.argv[2]
+
+    let numbers = process.argv.slice(3)
+
+    if(operation === undefined){
+
+        return "No operation provided..."
+
+    } if(operation !== "plus" || operation !== "minus"){
+
+        return `Invalid operation: ${operation}`
+
+    } if(numbers.length = 0){
+
+        return "No numbers provided..."
+
+    } if(operation === 'plus'){
+
+        let sum = 0
+
+        for(let i = 0; i < numbers.length; i++){
+
+            sum += numbers[i]
+
+        }
+
+        return sum
+
+    } else if(operation === "minus"){
+
+        let sum = number[0]
+
+        for(let i = 1; i < numbers.length; i++){
+
+            sum -= numbers[i]   
+        }
+
+
+        return sum
+    }
 
 // Don't change anything below this line.
 module.exports = calculator;
+//
+// 
+//
+// if(operation === undefined){
+//   return "No operation provided..."
+//} else if(operation !== "plus" || operation !== "minus"){
+
+//   return `Invalid operation: modulo`
+//}
+//
+// if(operation === "plus"){
+//     
+// 
+//for(let i = 3; i < process.argv.length; i++){
+//
+//    number += +process.argv[i]
+//    return number
+//}
+//
+//
+//
+//} else if(operation === "minus"){
+//
+//  for(let i = 3; i < process.argv.length; i++){
+//
+//  number -= +process.argv[i]
+//  return number
+//
+//} else {
+//  return "No numbers provided..."
+//}
+//
+//}
+//
+//
+//
+// process.argv[0] and process.argv[1] will not change
+// process.argv[2] will be "plus" or "minus"
+// process.argv[i] will be the number
+// process.argv[2] = operation
+//for(let i = 3; i < process.argv.length; i++)
+// let number