Kursinnehåll

JavaScript Data Structures

1. Introduction and Prerequisites

Introduction to JavaScript Data Structures Prerequisites for Learning JavaScript Data Structures What You'll Learn in This Course Tips for Success

2. Fundamentals of JavaScript Objects

Understanding Objects in JavaScript Creating Objects in JavaScript Working with Nested Object Properties Challenge: Create and Structure an Object Accessing Object Properties in JavaScript Challenge: Retrieve Object Property Values Managing Object Properties Challenge: Modify and Extend an Object Defining Object Methods Using Properties within Methods Challenge: Work with Object Methods Fundamentals of JavaScript Objects Sum-Up

3. Advanced Object Manipulation Techniques

Iterating Over Object Properties with the for...in Loop Challenge: Explore Object Properties with Iteration Using hasOwnProperty() to Check Object Properties Challenge: Object Property Iteration with hasOwnProperty()Cloning and Merging Objects with the Spread Operator Challenge: Combine Objects with the Spread Operator Destructuring Objects for Cleaner Code Challenge: Extract Data with Object Destructuring Advanced Object Manipulation Sum-Up

4. Mastering JavaScript Arrays

Understanding JavaScript Arrays Challenge: Access Array Elements Modifying Arrays and Accessing Elements Challenge: Modify Array Elements Iterating Over Arrays with the for Loop Challenge: Loop Through Arrays with for Using the for...of Loop for Array Iteration Challenge: Efficient Array Iteration with for...of Mastering JavaScript Arrays Sum-Up

5. Advanced Array Methods and Transformations

Transforming Arrays with the map() Method Challenge: Modify Array Elements Using map()Filtering Arrays with the filter() Method Challenge: Select Specific Data Using filter()Finding Elements in an Array with the find() Method Challenge: Search for Items Using find()Sorting Arrays with the sort() Method Challenge: Sort and Extract Data with sort()Advanced Array Methods and Transformations Sum-Up Course Summary

Challenge: Object Property Iteration with hasOwnProperty()

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:

name: Bohemian Rhapsody
band: Queen
released: 31 October 1975
duration: 355

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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