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Closures

A closure is a function bundled with the variables from its defining scope, which it can read and update after that scope has exited — the mechanism that lets returned and callback functions carry private state.

Questions this Concept answers

Why does an API take a closure instead of asking the caller to do the work itself before and after calling in?

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Closures (Anonymous Functions) and Variable Capture in Rust

A closure (anonymous function) in Rust is a function-like value that, unlike a named function, need not declare a name, parentheses for its parameter list, explicit parameter types, or a return type,…