Does Go provide REPL?

问题:

The interactive environment is VERY helpful for a programmer. However, it seems Go does not provide it. Is my understanding correct?

回答1:

No, Go does not provide a REPL.

However, as already mentioned, Go Playground (this is the new URL) is very handy. The Go Authors are also thinking about adding a feature-rich editor to it.

If you want something local, consider installing hsandbox. Running it simply with hsandbox go will split your terminal screen (with screen) where you can write code at the top and see its execution output at the bottom on every save.

There was a gotry among standard Go commands, which used to evaluate expressions (with an optional package name), and could be run like gotry 1+2 and gotry fmt 'Println("hello")' from shell. It is no longer available because not many people actually used it.

I have also seen third party projects for building a REPL for Go, but now I can only find links to two of them: igo and go-repl. How well do they work I don't know.

My two cents: Speed of compilation makes writing a REPL possible for Go, as it has also helped building the tools mentioned here, but the same speed makes REPL less necessary. Every time I want to test something in Go that I can't run in Playground I open a simple .go file and start coding and simply run the code. This will be even easier when the go command in Go 1 makes one-command build process possible and way easier.

UPDATE: Latest weekly release of Go added go command which can be used to very easily build a file: write your prog.go file and run go build prog.go && ./prog

UPDATE 2: With Go 1 you can directly run go programs with go run filename.go

UPDATE 3: gore is a new project which seems interesting.

回答2:

Try motemen/gore

Yet another Go REPL that works nicely. Featured with line editing, code completion, and more.

https://github.com/motemen/gore

回答3:

You also have a recent (March 2013) project called gore from Sriram Srinivasan, which can be useful:

gore is a command-line evaluator for golang code -- a REPL without a loop, if you will.
It is a replacement for the go playground, while making it much easier to interactively try out bits of code: gore automatically supplies boiler-plate code such as import and package declarations and a main function wrapper.
Also, since it runs on your own computer, no code is rejected on security grounds (unlike go playground's safe sandbox mode).

回答4:

Have you tried the Go Playground?

About the Go Playground

The Go Playground is a web service that runs on golang.org's servers. The service receives a Go program, compiles, links, and runs the program inside a sandbox, then returns the output.

回答5:

The GoSpeccy project includes a builtin REPL of a restricted subset of the Go language. The implementation is using goeval.

回答6:

If you're a Vim user, the vim-go plugin (https://github.com/fatih/vim-go) provides a command (GoRun) to run and print the output of the current buffer. You still have to include all the boilerplate code of a main Go file, but it still provides a convenient way to quickly test code snippets in your local environment.

HTH

回答7:

No, but you can exploit the speed of compilation (as mentioned in other answers).

Have a look at rango that uses a generate-compile-run loop to mimic a REPL. You can also start it with imports and statements to begin an interactive session.

回答8:

Gosh is the interactive Golang shell. The goal is to provide an easy-to-use interactive execution environment.

https://github.com/mkouhei/gosh

回答9:

You may also like to try https://github.com/haya14busa/goplay This enables you to run go code files from your terminal directly to the Go Playground

回答10:

Please also check www.gorepl.com for go REPL and other REPLs