feat: Add prime number finder in JavaScript

javascript/README.md

@@ -1,4 +1,4 @@
 # Javascript
 
 - hello_world.js | 2024-01-01 | 1 line
-- prime_number_finder.js | 2024-07-31 | 28 lines
+- prime-number-finder.js | 2024-07-31 | 26 lines

javascript/package.json

@@ -1,7 +1,7 @@
 {
   "name": "javascript-programs",
   "version": "1.0.0",
-  "description": "A collection of Javascript programs.",
+  "description": "A collection of JavaScript programs.",
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"

javascript/prime-number-finder.js

@@ -0,0 +1,26 @@
+// Function to check if a number is prime
+function isPrime(num) {
+  if (num <= 1) {
+    return false;
+  }
+  for (let i = 2; i <= Math.sqrt(num); i++) {
+    if (num % i === 0) {
+      return false;
+    }
+  }
+  return true;
+}
+
+// Get the number from the command line arguments
+const number = parseInt(process.argv[2]);
+
+// Check if the number is prime and print the result
+if (isNaN(number)) {
+  console.log("Please provide a valid number.");
+} else {
+  if (isPrime(number)) {
+    console.log(`${number} is a prime number.`);
+  } else {
+    console.log(`${number} is not a prime number.`);
+  }
+}