#Functional Programming

Articles about Functional Programming — exploring patterns, best practices, and real-world implementations in production systems.

3 posts tagged with functional programming. ← All posts

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Pratik Dhanave · ·6 min read

Iterators

Iterators are how Rust does loops without writing loops — a chain of composable adapters (map, filter, collect) that reads like a description of what you want, not how to get it. And the astonishing part is that this high-level, functional style compiles to code as fast as a hand-written loop. Zero-cost abstraction, at its most delightful.

Iterators are how Rust does loops without writing loops — a chain of composable adapters (map, filter, collect) that reads like a description of what you want. And the astonishing part is that this high-level style compiles to code as fast as a hand-written loop.

#Rust#Systems Programming#Programming Languages#Functional Programming
Pratik Dhanave · ·6 min read

Closures

Closures are anonymous functions that can capture variables from around them — and in Rust, the ownership model makes "capture" a precise, three-way question: does the closure borrow, mutably borrow, or take ownership of what it captures? Understanding that is what makes closures (and the iterators that depend on them) click.

Closures are anonymous functions that capture variables from around them — and in Rust the ownership model makes 'capture' a precise, three-way question: does the closure borrow, mutably borrow, or take ownership of what it captures?

#Rust#Systems Programming#Programming Languages#Functional Programming
Pratik Dhanave · ·8 min read

Closures and Function Pointers, Revisited

Module 2 introduced closures as anonymous functions that capture their environment. But once you start passing functions around as values — storing callbacks, building higher-order APIs, returning behavior from functions — a few subtleties surface: functions and closures aren't quite the same type, returning a closure requires a boxing trick, and the `Fn` trait family has a precise structure worth knowing. These details show up constantly in real Rust APIs, and mastering them makes you fluent in Rust's functional side.

Module 2 introduced closures. But once you start passing functions around as values — callbacks, higher-order APIs, returning behavior — subtleties surface: functions and closures aren't quite the same type, returning a closure requires a boxing trick, and the Fn trait family has a precise structure worth knowing.

#Rust#Closures#Programming Languages#Functional Programming#Systems Programming

All posts on this site are written by Pratik Dhanave, an Agentic AI Architect with 7+ years building production distributed systems, multi-agent AI platforms, and cloud-native infrastructure. About the author → Each article includes working code, architecture diagrams, and references to the specific frameworks and standards discussed. Browse all posts or explore related topics using the tag cloud above.