Course Content
JavaScript Data Structures
JavaScript Data Structures
2. Fundamentals of JavaScript Objects
Understanding Objects in JavaScriptCreating Objects in JavaScriptWorking with Nested Object PropertiesChallenge: Create and Structure an ObjectAccessing Object Properties in JavaScriptChallenge: Retrieve Object Property ValuesManaging Object PropertiesChallenge: Modify and Extend an ObjectDefining Object MethodsUsing Properties within MethodsChallenge: Work with Object MethodsFundamentals of JavaScript Objects Sum-Up
3. Advanced Object Manipulation Techniques
Iterating Over Object Properties with the for...in LoopChallenge: Explore Object Properties with IterationUsing hasOwnProperty() to Check Object PropertiesChallenge: Object Property Iteration with hasOwnProperty()Cloning and Merging Objects with the Spread OperatorChallenge: Combine Objects with the Spread OperatorDestructuring Objects for Cleaner CodeChallenge: Extract Data with Object DestructuringAdvanced Object Manipulation Sum-Up
4. Mastering JavaScript Arrays
Understanding JavaScript ArraysChallenge: Access Array ElementsModifying Arrays and Accessing ElementsChallenge: Modify Array ElementsIterating Over Arrays with the for LoopChallenge: Loop Through Arrays with forUsing the for...of Loop for Array IterationChallenge: Efficient Array Iteration with for...ofMastering JavaScript Arrays Sum-Up
5. Advanced Array Methods and Transformations
Transforming Arrays with the map() MethodChallenge: Modify Array Elements Using map()Filtering Arrays with the filter() MethodChallenge: Select Specific Data Using filter()Finding Elements in an Array with the find() MethodChallenge: Search for Items Using find()Sorting Arrays with the sort() MethodChallenge: Sort and Extract Data with sort()Advanced Array Methods and Transformations Sum-UpCourse 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.
const song = { name: "Bohemian Rhapsody", band: "Queen", released: "31 October 1975", duration: 355, }; ___ (___ ___ in ___) { if (song.___(key)) { console.log(`${key}:`, song[key]); } }
Expected output:
- Use a
for...in
loop to iterate through the object's properties. - Within the loop, check if each property is an own property of the object using
hasOwnProperty()
before logging it.
const song = { name: "Bohemian Rhapsody", band: "Queen", released: "31 October 1975", duration: 355, }; for (let key in song) { if (song.hasOwnProperty(key)) { console.log(`${key}:`, song[key]); } }
Everything was clear?
Thanks for your feedback!
Section 3. Chapter 4