JavaScript Data Structures

Conteúdo do Curso

JavaScript Data Structures

JavaScript Data Structures

1. Introduction and Prerequisites

Introduction to the Course Prerequisites for the Course What Will Be Covered Tips for Success

2. Objects Fundamentals

Understanding Objects Object Creation Nested Properties Challenge: Creating an Object Accessing Object Properties Challenge: Accessing Object Properties Working with Properties Challenge: Modifying and Extending Object Object Methods Properties in Methods Challenge: Working with Object Methods Object Fundamentals Sum Up

3. Advanced Object Manipulation

Object Iteration with for...in Loop Challenge: Object Property Explorer Method hasOwnProperty()Challenge: hasOwnProperty() for Object Property Iteration Spread Operator Challenge: Merging Objects and Adding Properties Object Destructuring Challenge: Destructuring Advanced Object Manipulation Sum Up

4. Mastering Arrays

Understanding Arrays Challenge: Array Element Accessor Working with Array Elements Challenge: Array Element Modifier for Loop Challenge: Array Element Iteration for...of Loop Challenge: Iteration with for...of Mastering Arrays Sum Up

5. Advanced Array Operations

map() Method Challenge: Array Element Transformation filter() Method Challenge: Filtering Students by Exam Scores find() Method Challenge: Discovering Featured Products sort() Method Challenge: Sorting and Extracting Properties Advanced Array Operations Sum Up Course Sum Up

for...of Loop

Syntax

The for...of loop is a more modern and concise way to iterate over arrays. It automatically handles the loop counter and provides direct access to each element's value. The syntax for a for...of loop is as follows:

In this syntax:

const element is a variable that stores the value of each element during each iteration;
of array specifies the array we want to iterate over.

Example

Here's an example of using the for...of loop to achieve the same result as the previous for loop:


              12345
            
const students = ["Brandon", "Mario", "Saul"];

for (const student of students) {
  console.log(student);
}

Line 1: It declares a constant variable named students and assigns it an array containing three strings - "Brandon", "Mario", and "Saul". This array represents a list of student names;
Line 3: It starts a for...of loop. The loop is used to iterate through each element in the students array one at a time;
Line 4: Inside the for...of loop, we use the console.log() function to log the value of the current element to the console. The student variable represents the current element in the array during each loop iteration. So, in the first iteration, it will be "Brandon", in the second iteration, "Mario", and in the third iteration, "Saul".

1. What is the primary advantage of using a `for...of` loop when iterating over arrays?

2. In the `for...of` loop syntax, what does the `const element` represent?

3. What is the purpose of the `of array` part in the `for...of` loop syntax?

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 4. Capítulo 7

some-alt