Variables and scoping in ECMAScript 6

Updated version of this blog post: Chapter “Variables and scoping” in “Exploring ES6”. This blog post examines how variables and scoping are handled in ECMAScript 6 [1]. Block scoping via let and const # Both let and const create variables that are block-scoped – they only exist within the innermost block that surrounds them. The following code demonstrates that the let-declared variable tmp only

[TokyoIncidents]

temporal dead zone (TDZ)

[rikuba]

"temporal dead zone (TDZ)"

[efcl]

letやconstのスコープやconstでのimmutableデータの扱いについて。 constとObject.freeze、TDZ、デフォルトパラメータとスコープ、グロール空間でのvar/functionとlet/const/classの違いについて