Section 01 : Closures

Author: Farahat612

1. Closures/01 2667. Create Hello World Function.js

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+var createHelloWorld = function () {
+  return () => 'Hello World'
+}
+
+// Other ways to do it:
+// 1. Using a function expression
+var createHelloWorld = function () {
+  return function helloWorld() {
+    return 'Hello World'
+  }
+}
+
+// 2. Using Arrow Syntax + Rest Arguments
+var createHelloWorld = function () {
+  return (...args) => 'Hello World'
+}

1. Closures/02 2620. Counter.js

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+var createCounter = function (n) {
+  return function () {
+    return n++
+  }
+}

1. Closures/03 2704. To Be Or Not To Be.js

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+var expect = function (val) {
+  return {
+    toBe: (anotherValue) => {
+      if (val !== anotherValue) {
+        throw new Error('Not Equal')
+      } else {
+        return true
+      }
+    },
+    notToBe: (anotherValue) => {
+      if (val === anotherValue) {
+        throw new Error('Equal')
+      } else {
+        return true
+      }
+    },
+  }
+}

1. Closures/04 2665. Counter II.js

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+var createCounter = function (init) {
+  let count = init
+  return {
+    increment: () => ++count,
+    decrement: () => --count,
+    reset: () => (count = init),
+  }
+}