var vs let vs const
var:
- hoisted (always declared at top of scope, global if none)
- function scope
let:
- block scope
- not redeclarable
const:
- block scope
- not reassignable
- not redeclarable
Note: Although it may seem like these hold only semantic meaning, using the
appropriate keywords helps the JS engines' compiler to decide on what to optimize.what is the different between var and let and const in js
var tester = "hey hi";
function newFunction() {
var hello = "hello";
}
console.log(hello); // error: hell
o is not definedCopyright © 2021 Codeinu
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