feat: add Semigroup algebraic structure - #593
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Add Semigroup interface and concrete implementations (Sum, Product, Str) with full test coverage including associativity law verification. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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Summary
Add the
Semigroupalgebraic structure to the FP library.A Semigroup represents types that have an associative binary operation (
concat). For any valuesa,b,c:What's included
Semigroup<T>interface with aconcat(other: T): TmethodSum— combines numbers by additionProduct— combines numbers by multiplicationStr— combines strings by concatenationsrc/index.ts