Kursinnhold
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
Advanced Array Methods and Transformations Sum-Up
map() Method
- Purpose: Iterates over each element of the original array and applies a specified callback function to produce a new array;
- Syntax:
array.map((element, index, array) => { // Callback body }); - Key Points:
- Does not modify the original array;
- Returns a new array of the same length;
- Useful for transforming each element of an array.
filter() Method
- Purpose: Selects elements that meet a particular condition, creating a new array;
- Syntax:
array.filter((element, index, array) => { // Callback body }); - Key Points:
- Does not alter the original array;
- Returns a new array containing elements that satisfy the callback condition;
- Provides a way to filter elements based on specific criteria.
find() Method
- Purpose: Discovers and retrieves the first matching element in an array;
- Syntax:
array.find((element, index, array) => { // Callback body }); - Key Points:
- Does not alter the original array;
- Halts upon locating the initial match, returning that specific element;
- Returns
undefinedif no matching element is found.
sort() Method
- Purpose: Modifies the original array, arranging its elements in a new order;
- Syntax:
array.sort((a, b) => { // Callback body }); - Key Points:
- Transforms the original array;
- By default, arranges elements in ascending order;
- Custom sorting can be achieved using a compare function.
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Seksjon 5. Kapittel 9
