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Functional Programming notes for developers

Master Functional Programming with a curated set of 2 developer notes — core concepts, patterns, and interview prep. Maintained by the DevRecall team.

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01 · Functional Programming

Pure Functions, Immutability & Composition

Functional Programming: Pure Functions, Immutability & Composition. Functional programming treats computation as the evaluation of pure functions, favoring immutable data and avoiding shared mutable state and side effect…

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02 · Functional Programming

Currying, Closures & Handling Failure Functionally

Functional Programming: Currying, Closures & Handling Failure. Currying, Partial Application & Closures. // Currying: transform a multi-arg function into a chain of // single-argument functions const add = a => b => a + …

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Interview Questions

TypeScript Interview Questions. Comprehensive TypeScript interview questions covering type system, generics, utility types, and best practices:. Fundamentals. 1. What is TypeScript?. TypeScript is a…

Mar 28, 2026

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TypeScriptgeneral

Advanced Types (Generics & Utility Types)

TypeScript Advanced Types. Generics. // Generic function function identity<T>(arg: T): T { return arg; } const num = identity<number>(42); // Explicit const str = identity('hello'); // Inferred //…

Mar 3, 2026

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