Can I help update the declaration of variables?. A good practice!

[jdavidleon]

Scope

let var const

function hi () { alert("hi") }

hi = function () { alert("hello") }

console.log(hi());  //"hello"

better

const hi = function () { alert("hi") }

hi = function () { alert("hello") }

console.log(hello);  // Uncaught TypeError: invalid assignment to const 'hi'

let obj = {};
obj = "string"; //"string"

better

const obj = {};
obj = "string";  // Uncaught TypeError: invalid assignment to const 'obj'