#Closures

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

2 posts tagged with closures. ← All posts

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Pratik Dhanave · ·9 min read

Closures and Scope: LEGB, nonlocal, and global

How Python decides what a name means — the LEGB lookup rule, what a closure actually captures, the late-binding loop trap and its fixes, and when you genuinely need `nonlocal` or `global`.

How Python decides what a name means — the LEGB lookup rule, what a closure actually captures, the late-binding loop trap and its fixes, and when you genuinely need `nonlocal` or `global`.

#Python#Closures#Scope#Software Engineering
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.