JavaScript Data Structures

Course Content

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

Challenge: hasOwnProperty() for Object Property Iteration

Task

Create a loop that iterates through the properties of an object and prints each property along with its value. However, you should only print properties that belong directly to the object, not those inherited from its prototype chain. Utilize the hasOwnProperty() method to achieve this.


              123456789101112
            
const song = {
  name: "Bohemian Rhapsody",
  band: "Queen",
  released: "31 October 1975",
  duration: 355,
};

___ (___ ___ in ___) {
  if (song.___(key)) {
    console.log(`${key}:`, song[key]);
  }
}

Expected output:

Use a for...in loop to iterate through the object's properties.
Within the loop, check if each property is an own property of the object using hasOwnProperty() before logging it.


              123456789101112
            
const song = {
  name: "Bohemian Rhapsody",
  band: "Queen",
  released: "31 October 1975",
  duration: 355,
};

for (let key in song) {
  if (song.hasOwnProperty(key)) {
    console.log(`${key}:`, song[key]);
  }
}

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Section 3. Chapter 4

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