GoPlus - The Go+ language for data science

Summary about Go+

What are mainly impressions about Go+?

A static typed language.
Fully compatible with the Go language.
Script-like style, and more readable code for data science than Go.

For example, the following is a legal Go+ source code:

a := [1, 2, 3.4]
println(a)

How do we do this in the Go language?

package main

func main() {
    a := []float64{1, 2, 3.4}
    println(a)
}

Of course, we don't only do less-typing things.

For example, we support list comprehension, which make data processing easier.

a := [1, 3, 5, 7, 11]
b := [x*x for x <- a, x > 3]
println(b) // output: [25 49 121]

mapData := {"Hi": 1, "Hello": 2, "Go+": 3}
reversedMap := {v: k for k, v <- mapData}
println(reversedMap) // output: map[1:Hi 2:Hello 3:Go+]

We will keep Go+ simple. This is why we call it Go+, not Go++.

Less is exponentially more.

It's for Go, and it's also for Go+.

Compatibility with Go

All Go features (not including cgo) will be supported.

See supported the Go language features.

All Go packages (even these packages use cgo) can be imported by Go+.

import (
    "fmt"
    "strings"
)

x := strings.NewReplacer("?", "!").Replace("hello, world???")
fmt.Println("x:", x)

Be interested in how it works? See Dive into Go+.

Also, all Go+ packages can be converted into Go packages, and then be imported by Go.

First, let's make a directory named tutorial/14-Using-goplus-in-Go.

Then write a Go+ package named foo in it:

package foo

func ReverseMap(m map[string]int) map[int]string {
    return {v: k for k, v <- m}
}

Then use it in a Go package:

package main

import (
	"fmt"

	"github.com/qiniu/goplus/tutorial/14-Using-goplus-in-Go/foo"
)

func main() {
	rmap := foo.ReverseMap(map[string]int{"Hi": 1, "Hello": 2})
	fmt.Println(rmap)
}

How to compile this exmaple?

gop go tutorial/ # Convert all Go+ packages in tutorial/ into Go packages
go install ./...

Or:

gop install ./... # Convert Go+ packages and go install ./...

Go tutorial/14-Using-goplus-in-Go to get the source code.

Tutorials

https://github.com/qiniu/goplus/tree/master/tutorial

Go+ features

Bytecode vs. Go code

Go+ suppports bytecode backend or generating Go code.

When we use gop go or gop install command, it generates Go code to covert Go+ package into Go packages.

When we use gop run command, it doesn't call go run command. It generates bytecode to execute.

Commands

gop go <gopSrcDir> # Convert all Go+ packages under <gopSrcDir> into Go packages, recursively
gop run <gopSrcDir> # Running <gopSrcDir> as a Go+ main package
gop run <gopSrcFile> # Running <gopSrcFile> as a Go+ script
gop install ./... # Convert all Go+ packages under ./ and go install ./...

The gop command isn't provided currently (in alpha stage). Instead, we provide the following commands:

qrun <gopSrcDir> # gop run <gopSrcDir>
qrun -asm <gopSrcDir> # generates `asm` code of Go+ bytecode backend
qrun -quiet <gopSrcDir> # don't generate any compiling stage log
qgo <gopSrcDir> # gop go <gopSrcDir>
qgo -test <gopSrcDir>

Note:

qgo -test <gopSrcDir> converts Go+ packages into Go packages, and for every package, it call go run <gopPkgDir>/gop_autogen.go and qrun -quiet <gopPkgDir> to compare their outputs. If their outputs aren't equal, the test case fails.

Map literal

x := {"Hello": 1, "xsw": 3.4} // map[string]float64
y := {"Hello": 1, "xsw": "Go+"} // map[string]interface{}
z := {"Hello": 1, "xsw": 3} // map[string]int
empty := {} // map[string]interface{}

Slice literal

x := [1, 3.4] // []float64
y := [1] // []int
z := [1+2i, "xsw"] // []interface{}
a := [1, 3.4, 3+4i] // []complex128
b := [5+6i] // []complex128
c := ["xsw", 3] // []interface{}
empty := [] // []interface{}

List/Map comprehension

a := [x*x for x <- [1, 3, 5, 7, 11]]
b := [x*x for x <- [1, 3, 5, 7, 11], x > 3]
c := [i+v for i, v <- [1, 3, 5, 7, 11], i%2 == 1]
d := [k+","+s for k, s <- {"Hello": "xsw", "Hi": "Go+"}]

arr := [1, 2, 3, 4, 5, 6]
e := [[a, b] for a <- arr, a < b for b <- arr, b > 2]

x := {x: i for i, x <- [1, 3, 5, 7, 11]}
y := {x: i for i, x <- [1, 3, 5, 7, 11], i%2 == 1}
z := {v: k for k, v <- {1: "Hello", 3: "Hi", 5: "xsw", 7: "Go+"}, k > 3}

For loop

sum := 0
for x <- [1, 3, 5, 7, 11, 13, 17], x > 3 {
    sum += x
}

Go features