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Generics and Trait Bounds in Rust

Generics let you write one piece of code that works for many types, and a trait bound is the condition you attach saying which types qualify. Instead of copying a function for every kind of value, you write it once and state what the value must be able to do. The compiler then makes a specialised version for each type actually used, so there is no speed penalty.

Questions this Concept answers

Why does generic Rust code usually cost nothing at run time compared with a version hand-written for one type?

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Rust Generics and Traits Explained: A Complete Guide for 2026

This guide explains how to write one piece of Rust code that works for many types. It starts from the problem of copying the same function for every kind of value, then shows how a type parameter let…