How do you create and use anonymous functions in Go?
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Updated 07 Apr 2025
The Go language enables anonymous functionalities that let developers define unnamed functions as literals. Anonymous functions serve two purposes in Go for encapsulating expressions that do not require reuse or as function arguments. Go allows users to assign anonymous functions to variables as well as pass them as arguments to functions and execute them directly (also known as IIFE – Immediately Invoked Function Expression).
In Go language development, you define anonymous functions by using the
funckeyword directly followed by the function parameters without a name declaration. The syntax allows you to specify parameters together with the return type as you would in a normal function definition. Anonymous functions provide an efficient solution for creating brief logical statements together with inline statements.An example demonstrates the creation and utilization of Go anonymous functions as shown below:
The add variable contains an anonymous function that accepts two integers as well as returns their summed result. The function can be invoked through the same method used to call named functions. The second function operates as an immediate invocation since it receives its definition and execution in the same statement, making it useful for temporary operations.
Anonymity functions in Go create versatile tools for dealing with transient procedures and closures, and callbacks, which enhance developer capability to build modular and clean code.