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.const let var
var makes real ice cubes that rattle around in New York
let makes real ice cubes in Manhatten
const is like let but the ice cubes never change because they are plasticCopyright © 2021 Codeinu
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