Putting It All Together

You now know variables, strings, numbers, booleans, arrays, if/else, loops, and functions. Let's see how they work as a team in one small program.

Here is a program that looks at a list of test scores and reports how many passed.

let scores = [55, 80, 42, 91, 68];

function isPass(score) {
  return score >= 50;
}

let passes = 0;

for (let i = 0; i < scores.length; i++) {
  if (isPass(scores[i])) {
    passes++;
  }
}

console.log(`${passes} out of ${scores.length} passed.`);

How it fits together

• An array holds all the scores.
• A function decides whether one score is a pass.
• A loop visits every score in the array.
• An if checks each score using the function.
• A variable (passes) keeps a running count.

This pattern of looping over a list, checking a condition, and counting is something you will use again and again in real programs.

Try it yourself

Change the scores or the pass mark inside isPass and watch the result update.