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Exercises

Recap Questions​

How do you initialize a variable in JavaScript?

By writing const followed by the desired variable name, then the equals sign, then the value we want to assign to the variable, e.g.:

const myAge = 99;
const myName = 'Jane';

Note: this is not the only way, because JavaScript has also the let keyword. We'll get to that at the right time.

What is the purpose of variables in programming?

They allow to store information in memory, and to retrieve it later. The information can be an explicit value, or the returned value from a function call, e.g.:

const price = 50;
const discountedPrice = getDiscountedPrice(30, 50);

Exercises​

Given the following functions:

function sum(a, b) {
  return a + b;
}

function square(n) {
  return n * n;
}

function squareRoot(n) {
  return Math.sqrt(n);
}

Use them to calculate the hypotenuse given the two other sides of the

Remember the pythagorean theorem to calculate the hypotenuse c given legs a and b: c=a2+b2c = \sqrt{a^2 + b^2}.

Note: the spirit of the exercise is to store the intermediate calculations in variables