From 25fb6b3bd78116c03051d7502626f63704ab4e1d Mon Sep 17 00:00:00 2001
From: jotaprojects <jotaprojects@gmail.com>
Date: Tue, 27 Feb 2024 23:25:28 +0100
Subject: [PATCH] Implement _check

---
 src/calculator.js      | 34 ++++++++--------------------------
 src/calculator.test.js |  2 +-
 2 files changed, 9 insertions(+), 27 deletions(-)

diff --git a/src/calculator.js b/src/calculator.js
index b46080e5..924b58e7 100644
--- a/src/calculator.js
+++ b/src/calculator.js
@@ -1,47 +1,29 @@
-exports._check = () => {
-  // DRY up the codebase with this function
-  // First, move the duplicate error checking code here
-  // Then, invoke this function inside each of the others
-  // HINT: you can invoke this function with exports._check()
-};
-
-exports.add = (x, y) => {
+exports._check = (x, y) => {
   if (typeof x !== 'number') {
     throw new TypeError(`${x} is not a number`);
   }
   if (typeof y !== 'number') {
     throw new TypeError(`${y} is not a number`);
   }
+};
+
+exports.add = (x, y) => {
+  exports._check(x, y);
   return x + y;
 };
 
 exports.subtract = (x, y) => {
-  if (typeof x !== 'number') {
-    throw new TypeError(`${x} is not a number`);
-  }
-  if (typeof y !== 'number') {
-    throw new TypeError(`${y} is not a number`);
-  }
+  exports._check(x, y);
   return x - y;
 };
 
 exports.multiply = (x, y) => {
-  if (typeof x !== 'number') {
-    throw new TypeError(`${x} is not a number`);
-  }
-  if (typeof y !== 'number') {
-    throw new TypeError(`${y} is not a number`);
-  }
+  exports._check(x, y);
   return x * y;
 };
 
 exports.divide = (x, y) => {
-  if (typeof x !== 'number') {
-    throw new TypeError(`${x} is not a number`);
-  }
-  if (typeof y !== 'number') {
-    throw new TypeError(`${y} is not a number`);
-  }
+  exports._check(x, y);
   return x / y;
 };
 
diff --git a/src/calculator.test.js b/src/calculator.test.js
index d0f85ed6..3d6b7f74 100644
--- a/src/calculator.test.js
+++ b/src/calculator.test.js
@@ -1,7 +1,7 @@
 /* eslint-disable no-unused-expressions */
 const calculator = require('./calculator');
 
-describe.skip('_check', () => {
+describe('_check', () => {
   beforeEach(() => {
     sinon.spy(calculator, '_check');
   });