Swift Types & FunctionsLesson 24Free preview

Swift Closures

This lesson is part of Swift · All levels

Summary

This lesson reviews Closures in Swift which are self-contained blocks of code (like an anonymous function or lambda) that can be stored in variables and passed to other functions. Closures can capture and store references to variables from the environment in which they are defined.

Key points

Closures are anonymous functional blocks.
Common syntax: '{(parameter) -> TypeReturn in instruction}'
Support for shorthand argument names ($0, $1, $2,...)
Trailing Closures allows the writing of closures outside the parentheses of the caller function if it is in the last argument
Supports higher-order functions such as maps, filters, and reduce

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