Kursinnehåll
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
Finding Elements in an Array with the find() Method
Let's explore the find() method, including its syntax and applications, with concrete examples to illustrate its functionality.
find()
While the filter() method sifts through an array to uncover all elements meeting a condition, the find() method is tailor-made for a singular mission – discovering and retrieving the first matching element. Here's a closer look at its syntax:
array.find((element, index, array) => {
// Callback body
});
Let's unravel the critical characteristics of the find() method:
- The original array remains unaltered;
- It navigates through the array, scrutinizing each element;
- The method halts upon locating the initial match, returning that specific element;
- Without a matching element, the method returns
undefined.
Find a Task by Order
In this example, the 'find()' method retrieves the task by the 'order' key.
const tasks = [ { order: 1, name: "Buy groceries" }, { order: 2, name: "Walk the dog" }, { order: 3, name: "Read a book" }, ]; const firstTask = tasks.find((element) => element.order === 1); console.log("First task:", firstTask.name); // Output: First task: Buy groceries const secondTask = tasks.find((element) => element.order === 2); console.log("Second task:", secondTask.name); // Output: Second task: Walk the dog
1. What is the primary purpose of the find() method?
2. What is a key characteristic of the find() method?
3. What will be the output in the given example below?
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Avsnitt 5. Kapitel 5
