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Function

A function isa block of code that can be run repeatedly by calling its name. It can take in values and return a value.

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

console.log(sum(10, 20));

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

console.log(sum(10, 20));

DRY (Don't Repeat Yourself) is a principle of software development. Effectively using functions makes the code not only shorter but also more maintainable.