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Practice

Combining Conditionals, Loops, and Functions

Conditionals, loops, and functions are the fundamental building blocks for controlling the flow of logic in programming.

Let's briefly review the role of each component.


Conditionals​

Conditionals execute code selectively based on a given condition.

Display different messages based on temperature
function checkTemperature(temperature) {
  if (temperature > 20) {
    console.log('It is warm');
  } else if (temperature > 10) {
    console.log('It is cool');
  } else {
    console.log('It is cold');
  }
}

checkTemperature(15);

Loops​

Loops repeatedly execute code as long as a given condition is true.

Print only even numbers from 1 to 10
for (let i = 1; i <= 10; i++) {
  if (i % 2 === 0) {
    console.log(i);
  }
}

Functions​

Functions group code into reusable units.

Calculate the average of a number array
function getAverage(numbers) {
  let sum = 0;

  for (let num of numbers) {
    sum += num;
  }

  return sum / numbers.length;
}

const scores = [90, 85, 78, 92];
const average = getAverage(scores);

console.log(`Average score: ${average}`);

Combining Conditionals, Loops, and Functions​

By combining these three logical structures, you can perform more complex tasks.

In the code central to this discussion, the getAverage function is used to first calculate the average score. Then a loop combined with conditionals is employed to print only the scores that are higher than the average.

By appropriately combining conditionals, loops, and functions, you can efficiently solve a wide variety of complex tasks.

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