In TypeScript, we can also set a value that a parameter will be assigned if the user does not provide one, or if the user passes undefined in its place.

buildName(undefined, "Adams")

If a default-initialized parameter comes before a required parameter, users need to explicitly pass undefined to get the default initialized value.

CoffeeScript is to Ruby as TypeScript is to Java/C#/C++.

If you love Ruby, you'll enjoy CoffeeScript as it makes the JavaScript more like the Ruby.

Open3.capture2e

require 'active_record/connection_adapters/postgis_adapter/railtie'

require 'active_record/connection_adapters/postgis/railtie'

with another instance as its receiver

まぶた）

Up for a Challenge?

Just to focus on the differences between lambdas and Procs, a lambda acts more like a real method. What does that mean?

When you create your own function to accept procs, the guts need to change a little bit because you'll need to use #call instead of yield inside (because which proc would yield run if you had more than one?).

Use that block of code (now called a Proc) as an input to a function by prepending it with an apersand &