Since there’s no type inference across methods, each method can be typecheckedġ00% in parallel, for fast performance.With a small amount of information, Sorbet can power autocompletion.This mix of type inferenceĪnd type annotations balances being explicit with being powerful: Sorbet does type inference for local variables within methods, and then requiresĪnnotations for method parameters and return types. Taking a step back, why do we need sigs in the first place? Preferred ways to define class methods with sigs:ĭef eet class Main # In this style, at the top level of the classĬlass << self class Main class << self # In this style, inside the `class << self` How a method isĭefined changes where the extend T::Sig line needs to go. There are many ways to define class (static) methods in Ruby. Main.name_length(eet( 'Alice')) # => error! Adding sigs to class methods The basic syntax looks like this: sig Įnd end # (3) It's an error to pass a void result to name_length: To be able to write signatures, we firstĮxtend T::Sig at the top of our class or module: extend T::Sig Why we’d want to add signatures in the first place.Method signatures are the primary way that we enable static and dynamic typeĬhecking in our code.

Reference of the types available for use within a sig, see the “Type System” This page describes the syntax of method signatures, or sigs.

Sionbet