Frege vs. Haskell

Enforces stateless, side-effect-free functions, ensuring thread safety and enabling compiler optimizations like caching, as highlighted in the Hello World example where pure functions are automatically cacheable.

Compiles to Java bytecode and allows calling any Java library while preserving functional guarantees through type declarations, enabling integration into existing Java projects without sacrificing platform benefits.

Supports lazy evaluation, infinite data structures, and global type inference, allowing concise code such as the Pythagorean triples list comprehension, making complex algorithms more readable.

Features global type inference with explicit purity tracking through IO types, providing robust error checking and safety without verbose annotations, as seen in the type system guarantees for impure functions.