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Conditional Statements and Loops in JavaScript

bookFiltering and Counting with Loops

Combining loops and conditions is a powerful way to process data in JavaScript. Imagine you have a list of student exam scores, and you want to know how many students passed. You can use a loop to go through each score, and a condition to check if it meets the passing standard. For instance, if the passing score is 60, you would count every score that is 60 or higher.


              
12345678910

            
const scores = [75, 42, 89, 55, 63, 48, 91, 60];
let passCount = 0;

for (let i = 0; i < scores.length; i++) {
  if (scores[i] >= 60) {
    passCount++;
  }
}

console.log("Number of students who passed: " + passCount);
copy

              
12345678910

            
const scores = [75, 42, 89, 55, 63, 48, 91, 60];
let passCount = 0;

scores.forEach(function(score) {
  if (score >= 60) {
    passCount++;
  }
});

console.log("Number of students who passed: " + passCount);
copy

1. Where should you place the condition to check if a score is passing when counting inside a loop?

2. Fill in the blank with the correct condition to count how many numbers in the array are even.

question mark

Where should you place the condition to check if a score is passing when counting inside a loop?

Select the correct answer

question-icon

Fill in the blank with the correct condition to count how many numbers in the array are even.

const numbers = [2, 5, 8, 13, 21, 34, 55, 89]; let evenCount = 0; for (let i = 0; i < numbers.length; i++) { if () { evenCount++; } } console.log("Number of even numbers: " + evenCount);
Number of even numbers: 3

Click or drag`n`drop items and fill in the blanks

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How can we improve it?

Thanks for your feedback!

SectionΒ 3. ChapterΒ 1

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bookFiltering and Counting with Loops

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Combining loops and conditions is a powerful way to process data in JavaScript. Imagine you have a list of student exam scores, and you want to know how many students passed. You can use a loop to go through each score, and a condition to check if it meets the passing standard. For instance, if the passing score is 60, you would count every score that is 60 or higher.


              
12345678910

            
const scores = [75, 42, 89, 55, 63, 48, 91, 60];
let passCount = 0;

for (let i = 0; i < scores.length; i++) {
  if (scores[i] >= 60) {
    passCount++;
  }
}

console.log("Number of students who passed: " + passCount);
copy

              
12345678910

            
const scores = [75, 42, 89, 55, 63, 48, 91, 60];
let passCount = 0;

scores.forEach(function(score) {
  if (score >= 60) {
    passCount++;
  }
});

console.log("Number of students who passed: " + passCount);
copy

1. Where should you place the condition to check if a score is passing when counting inside a loop?

2. Fill in the blank with the correct condition to count how many numbers in the array are even.

question mark

Where should you place the condition to check if a score is passing when counting inside a loop?

Select the correct answer

question-icon

Fill in the blank with the correct condition to count how many numbers in the array are even.

const numbers = [2, 5, 8, 13, 21, 34, 55, 89]; let evenCount = 0; for (let i = 0; i < numbers.length; i++) { if () { evenCount++; } } console.log("Number of even numbers: " + evenCount);
Number of even numbers: 3

Click or drag`n`drop items and fill in the blanks

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 3. ChapterΒ 1
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