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: Select Specific Data Using filter()

Task

Given an array of student objects, use the filter() method to create a new array called highScorers that includes only the students with exam scores greater than or equal to 90.

The original array is given as students, containing objects representing students with properties name and score.
Check if the student's score is greater or equal to 90.
Use the filter() method on the students array to create a new array, highScorers, that includes only the students with high scores.


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const students = [
  { name: "Alice", score: 92 },
  { name: "Bob", score: 87 },
  { name: "Charlie", score: 95 },
  { name: "David", score: 78 },
  { name: "Emma", score: 90 },
];

const highScorers = students.___((___) => {
  return ___;
});

for (let i = 0; i < highScorers.length; i += 1) {
  console.log(highScorers[i].name);
}

Expected output:

Alice
Charlie
Emma

The filter() method will create a new array by including only the elements that satisfy the condition specified in the callback function.


              123456789101112131415
            
const students = [
  { name: "Alice", score: 92 },
  { name: "Bob", score: 87 },
  { name: "Charlie", score: 95 },
  { name: "David", score: 78 },
  { name: "Emma", score: 90 },
];

const highScorers = students.filter((student) => {
  return student.score >= 90;
});

for (let i = 0; i < highScorers.length; i += 1) {
  console.log(highScorers[i].name);
}

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