Aprenda Filtering and Counting with Loops | Applying Logic and Writing Clean Code

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);


              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);

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.

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 3. Capítulo 1

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Suggested prompts:

Can you explain how the loop and condition work together in this example?

What would happen if the passing score was changed to a different value?

Can you show how to find the number of students who failed instead?

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              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);


              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);

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.

Tudo estava claro?

Obrigado pelo seu feedback!

Seção 3. Capítulo 1