Go: How Does defer Statement Work?

Illustration created for “A Journey With Go”, made from the original Go Gopher, created by Renee French.

ℹ️ This article is based on Go 1.12.

defer statement is a convenient way to execute a piece of code before a function returns, as explained in Golang specification:

Instead, deferred functions are invoked immediately before the surrounding function returns, in the reverse order they were deferred.