Commands
qrun <qlangSrcDir>
- qrun run a qlang program from specified directory. It acts like
go run <golagSrcDir>/*.go
Variable & operator
x := 123.1 - 3i
y, z := 1, 123
s := "Hello"
println(s + " complex")
println(x - 1, y * z)
Condition
x := 0
if t := false; t {
x = 3
} else {
x = 5
}
x = 0
switch s := "Hello"; s {
default:
x = 7
case "world", "hi":
x = 5
case "xsw":
x = 3
}
v := "Hello"
switch {
case v == "xsw":
x = 3
case v == "Hello", v == "world":
x = 5
default:
x = 7
}Import go package
import (
"fmt"
"strings"
)
x := strings.NewReplacer("?", "!").Replace("hello, world???")
fmt.Println("x:", x)Func & closure
import (
"fmt"
"strings"
)
func foo(x string) string {
return strings.NewReplacer("?", "!").Replace(x)
}
func printf(format string, args ...interface{}) (n int, err error) {
n, err = fmt.Printf(format, args...)
return
}
x := "qlang"
fooVar := func(prompt string) (n int, err error) {
n, err = fmt.Println(prompt + x)
return
}
printfVar := func(format string, args ...interface{}) (n int, err error) {
n, err = fmt.Printf(format, args...)
return
}Map, array & slice
x := []float64{1, 3.4, 5}
y := map[string]float64{"Hello": 1, "xsw": 3.4}
a := [...]float64{1, 3.4, 5}
b := [...]float64{1, 3: 3.4, 5}
c := []float64{2: 1.2, 3, 6: 4.5}Map literal
x := {"Hello": 1, "xsw": 3.4} // map[string]float64
y := {"Hello": 1, "xsw": "qlang"} // 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": "qlang"}]
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: "qlang"}, k > 3}For loop
sum := 0
for x <- [1, 3, 5, 7, 11, 13, 17], x > 3 {
sum += x
}