What is Control Flow?

Updating bindings succinctly

Especially when looping, a program often needs to "update" a binding to hold a value based on that binding's previous value.

counter = counter + 1;

JavaScript provides a shortcut for this.

counter += 1;

Similar shortcuts work for many other operators, such as result *= 2 to double result or counter -= 1 to count downward.

This allows us to shorten our counting example a little more.

for (let number = 0; number <= 12; number += 2) {
  console.log(number);
}

For counter += 1 and counter -= 1, there are even shorter equivalents: counter++ and counter--.