finally finished lab

index.js

@@ -4,7 +4,44 @@
  * 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() {
+// let argvs = process.argv.slice(2)
+// if (argvs < 1 ){
+// return "No operation provided..."
+// } else if (argvs[0] === "plus" || argvs[0] === "minus" && )
+
+// if (argvs[0] === "plus"){
+// return a + b
+// } else if (argvs[0] === "minus"){
+// return a - b
+// }
+// return a + b; 
+// }
+function calculator() {
+ if (!process.argv[2]) {
+ return "No operation provided...";
+} if (!process.argv[3]){
+ return "No numbers provided...";
+ } if (process.argv[2] === "plus") {
+ let newArg = process.argv.slice(3);
+ let sum = 0;
+ sum = newArg.reduce((accumulator, value) => {
+ return accumulator + +value}, 0);
+ return sum;
+ } if( process.argv[2] === 'minus'){
+ let newArg = process.argv.slice(3); 
+ let result = newArg[0]
+ for(let i = 1; i < newArg.length; i++){
+ result -= Number(newArg[i])
+}
+ return result
+ } if (process.argv[2] !== "plus" || process.argv[2] !== "minus") {
+ return "Invalid operation: modulo"
+} 
+}
+// const commandPlus = "plus";
+// const commandMinus = "minus";
+// const numbers = ["5", "10"];
+// process.argv.push(command, ...numbers);
 // Don't change anything below this line.
 module.exports = calculator;