Exploring Lexical Scope in Javascript

JavaScript uses lexical scoping, meaning that functions are executed using the variable scope that was in effect when they were defined, not when they are invoked.

Source Code

let a = 'global';
function outer() {
  let b = 'outer';
  function inner() {
    let c = 'inner';
    console.log(c); // inner
    console.log(b); // outer
    console.log(a); // global
  }
  inner();
}
outer();