Stack3web
diff --git a/‎32-The-Basics-of-Testing/03-hidash/index.js‎
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diff --git a/‎32-The-Basics-of-Testing/03-hidash/index.test.js‎
Lines changed: 41 additions & 0 deletions b/‎32-The-Basics-of-Testing/03-hidash/index.test.js‎
Lines changed: 41 additions & 0 deletions
diff --git a/‎32-The-Basics-of-Testing/README.md‎
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@@ -0,0 +1,15 @@
+module.exports = {
+  forEach(arr, fn) {
+    for (let index in arr) {
+      fn(arr[index], index)
+    }
+  },
+  map(arr, fn) {
+    const result = []
+    for (let i = 0; i < arr.length; i++) {
+      result.push(fn(arr[i], i))
+    }
+
+    return result
+  },
+}
@@ -0,0 +1,41 @@
+const { forEach, map } = require('./index')
+
+const test = (desc, fn) => {
+  console.log('----', desc)
+  try {
+    fn()
+  } catch (err) {
+    console.log(err.message)
+  }
+}
+
+test('The forEach function', () => {
+  let sum = 0
+  forEach([1, 2, 3], (value) => {
+    sum += value
+  })
+
+  // if (sum !== 7) { // This throws an error
+  if (sum !== 6) {
+    throw new Error('Expected summing array to equal 6')
+  }
+})
+
+test('The map funciton', () => {
+  const result = map([1, 2, 3], (value) => {
+    return value * 2
+  })
+  //  result === [2, 4, 6]
+
+  if (result[0] !== 2) {
+    throw new Error(`Expected to find 2, but found ${result[0]}`)
+  }
+
+  if (result[1] !== 4) {
+    throw new Error(`Expected to find 4, but found ${result[1]}`)
+  }
+
+  if (result[2] !== 6) {
+    throw new Error(`Expected to find 6, but found ${result[2]}`)
+  }
+})
@@ -21,3 +21,5 @@
 ## 3. 03 A No-Frills Testing Implementation
 
 ## 4. 04 Test Driven Development
+
+## 5. 05 Fixing Three Issues