Javascript variables
From wikinotes
Variable Scope
execute-context-scoped: # variable scoped to function, or module if not defined in function block-scoped: # variable scoped to the { ... } contents
Declaration & Assignment
var foo // declare var (execute-context-scoped) let foo // declare var (block-scoped) const foo // declare constant (read-only) (block scoped) var foo = "bar" // declare/assign variable (execute context scoped) let foo = "bar" // declare/assign variable (block scoped)