refactor: iteration

Author: brijeshkumar-chavda

18_break_and_continue/1_break_keyword.js

@@ -1,8 +1,8 @@
 // Break Keyword
 
-for (let variable = 0; variable < 10; variable++) {
-  if (variable === 5) {
+for (let index = 0; index < 10; index++) {
+  if (index === 5) {
     break;
   }
-  console.log(variable);
+  console.log(index);
 }

18_break_and_continue/2_continue_keyword.js

@@ -1,8 +1,8 @@
 // Continue Keyword
 
-for (let num = 0; num < 10; num++) {
-  if (num === 5) {
+for (let index = 0; index < 10; index++) {
+  if (index === 5) {
     continue;
   }
-  console.log(num);
+  console.log(index);
 }

19_Iterations/1_for_loop.js

@@ -33,6 +33,7 @@ for (let index = 0; index <= 10; index++) {
   console.log(index);
 }
 
+// Nested for loop
 for (let i = 1; i <= 10; i++) {
   // console.log(`Outer loop: ${i}`);
   for (let j = 1; j <= 10; j++) {

19_Iterations/5_for_of_loop.js

@@ -16,7 +16,6 @@
 // Note
 // - The order of iteration is guaranteed.
 // - Not recommended to use on object.
-// - Unlike traditional for loops, for...of doesn't give you access to the current index directly. If you need the index, you can use a combination of for...of with a traditional for loop (nested or with an index counter).
 // - The for...of loop doesn't modify the original iterable object. It iterates over a copy of the values.
 
 // Syntax

19_Iterations/7_for_each.js

@@ -56,6 +56,8 @@ array1.forEach((element) => {
 
 // Note
 // - The forEach() method accepts a callback function as its argument, which is invoked for each element in the array. The callback function takes three parameters: the current element being processed, the index of the current element, and the array or array-like object being iterated.
+
+
 // - The forEach() method in JavaScript doesn't return a value itself. Here's a breakdown of why:
 
 // Purpose of forEach()

19_Iterations/9_map.js

@@ -24,23 +24,21 @@ const array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
 const newNumbers = array.map((number) => number < 10);
 console.log(newNumbers);
 
-// EXAMPLE
-const array1 = [
-  {
-    key1: "value1",
-    key2: "value2",
-    key3: "value3",
-    sameKey: "same value",
-  },
-  {
-    key4: "value4",
-    key5: "value5",
-    key6: "value6",
-    sameKey: "same value",
-  },
+const books = [
+  { title: "Book One", genre: "Fiction", publish: 1981, edition: 2004 },
+  { title: "Book Two", genre: "Non-Fiction", publish: 1992, edition: 2008 },
+  { title: "Book Three", genre: "History", publish: 1999, edition: 2007 },
+  { title: "Book Four", genre: "Non-Fiction", publish: 1989, edition: 2010 },
+  { title: "Book Five", genre: "Science", publish: 2009, edition: 2014 },
+  { title: "Book Six", genre: "Fiction", publish: 1987, edition: 2010 },
+  { title: "Book Seven", genre: "History", publish: 1986, edition: 1996 },
+  { title: "Book Eight", genre: "Science", publish: 2011, edition: 2016 },
+  { title: "Book Nine", genre: "Non-Fiction", publish: 1981, edition: 1989 },
 ];
 
-const newArray3 = array1.map((object) => {
-  return object.sameKey;
-});
-console.log(newArray3);
+const fictionBook = books
+  .filter((book) => book.genre === "Fiction")
+  .filter((book) => book.edition > 2000)
+  .map((book) => book.edition + 1000);
+
+console.log(fictionBook);

playground.js

@@ -4,4 +4,8 @@ const myMap = new Map([
   ["key3", "value3"],
 ]);
 
-console.log(myMap);
+// console.log(myMap);
+
+for (const key of myMap) {
+  console.log(myMap[key]);
+}