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↑ JavaScript

JavaScript - Variables

Variables are named using the 🔒 camelCase convention
Since JavaScript is built around objects, variables can hold anything

var x = 32; // mutable (scoped to function)
let x = 32; // mutable (scoped to block)
const x = 32; // immutable (scoped to block)

Declaration chaining is not recommended for readability

var x = 4, y = 5

Var vs Let vs Const

var is function scoped or globally scoped and mutable
let is block scoped and mutable
const is block scoped and immutable


function func() {
  var x = "hello";
  let y = "world";
  console.log(x, y); // hello world
  
  {
    var w = "hello";
    let z = "world";
    console.log(w, z); // hello world
  }
  console.log(w); // hello
  console.log(z); // ReferenceError: z is not defined
}

var x = 1;
{
  var x = 2;
}
console.log(x); // 2

let x = 1;
{
  let x = 2;
}
console.log(x); // 1

const c = 1;
{
  const c = 2;
}
console.log(c); // 1;

Scope

Since var and let are mutable this can lead to some scope issues

var color = 'purple' // let produce the same result
console.log(color) // purple
color = 'black'
console.log(color) // black
function changeColor() {
  color = 'blue'
  // var color = 'blue' // uncomment for fix
}
console.log(color) // black
changeColor()
console.log(color) // expected: black, actual: blue 🗿

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List of note Indexes

JavaScript - Variables

Var vs Let vs Const

Scope