Create: 2704-to-be-or-not-to-be.js

Author: Sumit Sahoo

javascript/2704-to-be-or-not-to-be.js

@@ -0,0 +1,21 @@
+/**
+ * Creates an expectation object for testing values.
+ * 
+ * @param {any} val - The value to be tested.
+ * @returns {Object} An object with two methods:
+ *   - toBe(expected): Returns true if val === expected, otherwise throws an error "Not Equal".
+ *   - notToBe(expected): Returns true if val !== expected, otherwise throws an error "Equal".
+ */
+const expect = (val) => {
+    const throwError = (message) => { throw new Error(message); };
+    return {
+        toBe: (expected) => val === expected || throwError("Not Equal"),
+        notToBe: (expected) => val !== expected || throwError("Equal")
+    };
+};
+
+// Example usage:
+// expect(5).toBe(5); // returns true
+// expect(5).notToBe(3); // returns true
+// expect(5).toBe(3); // throws "Not Equal"
+// expect(5).notToBe(5); // throws "Equal"