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Author: ShivamMaurya2002

JavaScript Interview Programs/Check Prime Number.js

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+// ******************************************************************** Check Prime Number in Different Ways ********************************************************************
+
+// 1. Check if a number is prime:
+
+// Check if a number is prime using a basic loop (brut Force Method):
+function isPrime(num) {
+
+    if (num < 2) {
+        return false;
+    }
+
+    for (let i = 2; i < num; i++) {
+        if (num % i === 0) {
+            return false;
+        }
+    }
+
+    return true;
+}
+console.log("Is the given number prime?", isPrime(7));
+// Output: 
+// Is the given number prime?  true
+
+// OR
+
+// Check if a number is prime using a basic loop (brut Force Method):
+const num = 7;
+// Check if the number is prime
+let IsPrime = true;
+for (let i = 2; i < num; i++)
+    {
+        if (num % i === 0)
+            {
+                IsPrime = false;
+                break;
+            }
+    }
+    
+console.log("Is The Given Number Prime?", IsPrime); 
+// Output: 
+// Is The Given Number Prime? true
+
+// 2. Check if a number is prime Using Arrow Function:
+const Prime = (n) => {
+
+    if (n < 2) return false;
+    
+    for (let i = 2; i <= Math.sqrt(n); i++) {
+
+        if (n % i === 0) return false;
+
+    }
+
+  return true;
+
+};
+
+console.log("Is prime?", Prime(11)); 
+// Output:
+// Is prime? true