39.var.md

39. var

Problem

https://bigfrontend.dev/quiz/var

Problem Description

What does the code snippet below output by console.log?

function foo() {
  console.log(i);
  for (var i = 0; i < 3; i++) {
    console.log(i);
  }
}

foo();

Answer

function foo() {
  console.log(i); // undefined
  for (var i = 0; i < 3; i++) {
    console.log(i); // 0, 1, 2
  }
}

foo();