Hoist Tests comparing var let and const

hoist-var-let-const.js

/*
  var is function scoped & hoisted
  let is block scoped & not hoisted
  const is block scoped & not hoisted
*/

(() => {
  'use strict'
  const tests = [
    () => {
      console.info(a) // undefined
      var a = 1
    }, 
    () => {
      console.info(a) // throws error
      let a = 1
    },
    () => {
      console.info(a) // throws error
      const a = 1
    }
  ]
  
  for (let test of tests) {
    try { test() }
    catch(e) { console.error(e) }
  }
})()