Scope of variables and constants

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There are several ways to start declaring and using variables and constants. In general the best is to use the let keyword.

examples/basic/variables.js

x = "Joe"
var y = "Jane"
let z = "George"
const w = "nothing"

console.log(x) // Joe
console.log(y) // Jane
console.log(z) // George
console.log(w) // nothing