Vivienne Reay

Functions

Functions are like mini-programs that group together code blocks to perform specific tasks. They can make your code cleaner, reusable, and easier to manage. Functions can return values using the return keyword. The returned value can be used by other functions or assigned to variables.

function greetStudent(student) {
  console.log(`Hello, ${student.name}!`);
}

The interpolated string, also known as a template literal, is created using backticks in JavaScript. It allows you to embed expressions within the string. In this case, it’s dynamically inserting the value of student.name into the string. So, if student.name is, for instance, "John", the resulting string would be “Hello, John!”.

function timeRemaining(timeElapsed, endTime) {
  return endTime - timeElapsed;
}

var left = timeRemaining(42, 240);

left; // 198

The function timeRemaining calculates the time remaining by subtracting timeElapsed from endTime. We are calling the function with timeElapsed set to 42 and endTime set to 240. The result, left, would be the time remaining, which is 240 - 42 = 198.