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: Access Array Elements
Task
- Create an array called
stars
with the following star names:- "Sirius";
- "Alpha Centauri";
- "Betelgeuse";
- "Polaris".
- Log individual star names using different indices (0, 1, 2, and 3) using
console.log
const stars = ___; console.log("First element:", ___); // Output: Sirius console.log("Second element:", ___); // Output: Alpha Centauri console.log("Third element:", ___); // Output: Betelgeuse console.log("Forth element:", ___); // Output: Polaris
Expected output:
- Use square brackets
[]
to create an array. - Separate each element with the comma
,
. - Use
console.log()
to log the value of the array element at the specified index.
const stars = ["Sirius", "Alpha Centauri", "Betelgeuse", "Polaris"]; console.log("First element:", stars[0]); // Output: Sirius console.log("Second element:", stars[1]); // Output: Alpha Centauri console.log("Third element:", stars[2]); // Output: Betelgeuse console.log("Forth element:", stars[3]); // Output: Polaris
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Section 4. Chapter 2