From dba1f99f109e4facc350e48c026046603014ac6b Mon Sep 17 00:00:00 2001
From: riyaalexander <riyaalexander@Riyas-Air.fios-router.home>
Date: Wed, 19 Oct 2022 16:52:25 -0400
Subject: [PATCH] javascript on your machine

---
 index.js          | 31 ++++++++++++++++++++++++++++++-
 package-lock.json |  1 +
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 3bb4d07..53523cb 100644
--- a/index.js
+++ b/index.js
@@ -4,7 +4,36 @@
  * 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)
+    let operator = process.argv[2]
+    // checking for no operation
+    if (!operator){
+        return "No operation provided..."
+    } 
+    // checking for numbers
+    if (process.argv[3] === undefined){
+        return "No numbers provided..."
+    }
+    // check for other operators that are not plus or minus
+    if (!(operator.includes("plus") || operator.includes('minus'))) {
+        return `Invalid operation: ${operator}`
+    }
+    // for loop: initialize, condition, change
+    let sum = Number(process.argv[3])
+    for (let i = 4; i < process.argv.length; i++) {
+         // plus operation
+    if (operator === "plus") {
+        sum += Number(process.argv[i])
+    } else if (operator === "minus") {
+        sum -= process.argv[i]
+    }   
+    }// end of for loop
+
+        return sum
+    }// end of function
+
+
 
 // Don't change anything below this line.
 module.exports = calculator;
diff --git a/package-lock.json b/package-lock.json
index 99b1c39..ce6f0ea 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,6 +5,7 @@
   "requires": true,
   "packages": {
     "": {
+      "name": "8-0-javascript-on-your-machine-lab",
       "version": "1.0.0",
       "license": "ISC",
       "devDependencies": {