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Book Overview & Buying
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Table Of Contents
The Rust Programming Handbook
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We’ve touched on closures briefly with iterator adapters such as map and filter before. Now, let’s explore them in a more friendly way. Closures are simply anonymous functions that you can define right where you’re using them. They’re perfect for quick, one-time logic without the fuss of creating a full, named function with fn. What really makes closures special is their ability to “pick up” variables from the surrounding scope, or their “environment.” This feature makes them incredibly handy for crafting small, context-aware functions whenever you need them, right on the spot!
Here’s a friendly explanation of closures: the basic syntax uses vertical bars, | |, for parameters, followed by the body of the closure, which can be a single expression or a block in curly braces, {}. One of the great things about closures is that the Rust compiler is really good at...