Closures Ocaml Programming Chapter 9 Net Worth 2026: Salary, Income & Wealth

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HM type inference of `let` expressions led to type schemes, which enabled polymorphism. Add mutability, though, could lead to a ...

In this segment I explain

Compilers translate code from one language to another. Interpreters execute code. Virtual machines and just-in-time compilation ...

The semantics of `let` uses a notion of substitution, but, how should that be defined? These examples lend intuition. Textbook: ...

An example of how environment-model evaluation works. Substitution-model evaluation is list-like; environment-model, tree-like.

What happens when HM type inference is over? Either a "principal type" is found, or a type error has been detected. Textbook: ...

OCaml

Achieving polymorphism for `let` expressions in HM type inference leads to "type schemes", which universally quantify over type ...

How to evaluate a core fragment of

A comparison of big-step vs. small-step semantics, and substitution model vs. environment model Textbook: ...

Small- and big-step evaluation relations are themselves related: the big-step is an abstraction of the small-step Textbook: ...

How to infer the type of function applications in HM type inference Textbook: https://cs3110.github.io/textbook.