A function scope is in a way also a block scope, so let and constwould behave the same way they did in our previous examples. However, function scopes also encapsulate variables declared with var .

Topics covered in the workshop span a wide range of modern JavaScript capabilities, including built-in methods for streamlining code, robust exception handling, variable scope and hoisting, ES6 ...

i.e. intuitively it looks like the variable will only be available within the block but it is accessible outside the block .. in javascript's case, because var doesn't make a block level ...