A return statement without arguments returns the named return values. As pointed out by several persons, another benefit of named return values is the use in closures (i.e. It's currently not consistent in that methods without return values don't require a return statement at the end. Exercise: Images. Otherwise, leave the return values as zero. I asked the Go community for their opinions about using named arguments and naked returns: Define your own Image type, implement the necessary methods, and call pic.ShowImage.. Bounds should return a image.Rectangle, like image.Rect(0, 0, w, h).. ColorModel should return color.RGBAModel. A go function can have named return values. It is also ok to name some of the return values. I tested in the following code and in function b it returns 1 because it wasn't the "A return statement without arguments" case mentioned above. Named return values are a powerful tool. To unsubscribe from this group and stop receiving emails from it, send an email to golan...@googlegroups.com . Dec 25, 2019 Good evening. Thus makes it very helpful for complicated calculations where multiple values are calculated in many different steps. With named return values , the return values did not need to be initialised in the function. Pretty much every high-level language has a problem of not always being obvious, so be careful with that. Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
The swap function returns two strings. Named return values in Golang.

Named Return Values. Next example: Variadic Functions . Return is a control statement, but at the very end of the function it doesn't serve this purpose in any way. BTW, this change would be 100% backwards-compatible. But with great power comes great risk. Named Return Values. With named return values , the return values did not need to be initialised in the function. Let’s rewrite the getStockPriceChange function that we saw in the previous section with named return values - Remember the picture generator you wrote earlier? ok is false if there are no more values to receive and the channel is closed. A go function can have named return values. If so, they are treated as variables defined at the top of the function.

The named variables are specified in the signature itself.

The return argument is named for the AddNumbers function but never used. Receivers can test whether a channel has been closed by assigning a second parameter to the receive expression: after v, ok := <-ch.

Hello, 世界. The return values of a function in Golang may be named. A fickle companion. deferred functions are allowed to modify named results before the function actually returns. If a return value is named, it can be considered as being declared as a variable in the first line of the function. func f() (i int, s string) { i = 17 s = "abc" return // same as return i, s} Named return parameters are initialized to their zero values. The tour is divided into a list of modules that you can access by clicking on A Tour of Go on the top left of the page. These names should be used to document the meaning of the return values. If you specify a different return statement, like say return 5, nil, then the named variable is ignored and the explicitly returned values are what is sent back. The return values of a function in Golang may be named. In conclusion. But as what I have learned from A Tour of Go - Named return values.

Without named values, only return type is specified. Multiple results.