Is type inference good or bad?

While type inference is really useful for local variables, it should not be used for public APIs which have to be unambiguously documented. And sometimes the types really are critical for understanding what’s going on in the code. In such cases, it would be foolish to rely on type inference alone.

Does Haskell use Hindley-Milner?

A Hindley–Milner (HM) type system is a classical type system for the lambda calculus with parametric polymorphism. Since then, HM has been extended in various ways, most notably with type class constraints like those in Haskell. …

Is Hindley-Milner in Rust?

Rust uses Hindley-Milner type inference. OCaml uses Hindley-Milner. Swift apparently uses a variant of the system with more features.

How does type inference work?

Type inference is the ability to automatically deduce, either partially or fully, the type of an expression at compile time. The compiler is often able to infer the type of a variable or the type signature of a function, without explicit type annotations having been given.

Does Haskell have type inference?

Type inference is the process by which Haskell ‘guesses’ the types for variables and functions, without you needing to specify these types explicitly. Many functional languages feature type inference. There is lots of theory behind type inference — Hindley-Milner type systems and Unification.

What is the Haskell type system?

Haskell is a statically typed language. Every expression in Haskell has a type, including functions and if statements. The compiler can usually infer the types of expressions, but you should generally write out the type signature for top level functions and expressions.

How does TypeScript type inference work?

TypeScript can infer the data type of a variable as we assign values to them. For example, if we assign a value to a number, then it automatically knows that the value is a number without us telling it explicitly in the code that the variable has the data type number.