Use ternary operator in Golang
Golang's design philosophy is that there is only one solution to a thing, so even ternary operations are not provided. The official idea is to use if / else instead of ternary operations.
If you're used to writing code with more general statements, you might want to write code like this:
var a = 20 > 50 ? true: false; // a = false
var b = a || 100 // b = 100
var c = b && 50 // c = 50
var fn = c > 40 && func(){ return "ok" } // fn = "ok"After using hit, the above code can be written in this way:
var a = If(20 > 50, true, false) // a = false
var b = Or(a, 100) // b = 100
var c = If(b, 50) // c = 50
var fn = If(c > 40, func(){ return "ok" }) // fn = "ok"Beatle! Abandon dogma and enjoy hit.
Install
$ go get github.com/ymzuiku/hit
Only two API
func If(args ...interface{}) interface{}
func Or(args ...interface{}) interface{}Examples
When need return the param, and the param is
funcrun it and use return value
Condition implicit conversion to FALSE
- nil
- 0
- error
- ""
- "f", "F", "false", "FALSE", "False"
- "0", "0.0", "-0"
If(a, b, c) such as a ? b : c
if a == TRUE, return b, else return c
import . "github.com/ymzuiku/hit"
func main(){
value1 := If(20 > 5, "ok", "cancel")
log.Println(value1) // ok
value2 := If("test", "ok", "cancel")
log.Println(value2) // ok
value3 := If("", "ok", "cancel")
log.Println(value3) // cancel
value4 := If("false", "ok", "cancel")
log.Println(value4) // cancel
value5 := If(5, "ok", "cancel")
log.Println(value5) // ok
value6 := If(0, "ok", "cancel")
log.Println(value6) // cancel
value7 := If(nil, "ok", "cancel")
log.Println(value7) // cancel
value8 := If(errors.New("test-error"), func() { log.Println("if err != nil, this param no use" }) // value8 is error
// If any params is tpyeof `func()`, hit run it and return <nil>
value9 := If(20 > 5, func() { log.Println("ok") }, func() { log.Println("cancel") }) // run: log.Println("ok"), value = nil
// If any params is tpyeof `func()interface{}`, hit can run it and use condition.
value10 := If(func() interface{} { return true }, func()interface{} { return "ok" }, func()interface{} { return "cancel" })
log.Println(value9) // ok
}If(a, b) such as a && b
if a == TRUE, return b, else return nil
import . "github.com/ymzuiku/hit"
func main(){
value1 := If("test", "ok")
log.Println(value1) // "ok"
value2 := If(500, "ok")
log.Println(value2) // 500
value3 := If(func() interface{} { return false }, func() { log.Println("this func no run") })
log.Println(value3) // func no run, and value = nil
value4 := If(func() interface{} { return true }, func() interface{} { log.Println("func is run"); return 50 })
log.Println(value4) // func is run, and value = 50
}Or(a, b) such as a || b
if a == TRUE, return a, else return b
import . "github.com/ymzuiku/hit"
func main(){
value1 := Or("test", "ok")
log.Println(value1) // "test"
value2 := Or(500, "ok")
log.Println(value2) // "ok"
value3 := Or(func() interface{} { return 100 }, func() { log.Println("this func no run") })
log.Println(value3) // func no run, and value = 100
value4 := Or(func() interface{} { return false }, func() interface{} { log.Println("func is run"); return 50 })
log.Println(value4) // func is run, and value = 50
}Test list:
Pass test to 100% coverage, view test code: hit_test.go
License
MIT License
Copyright (c) 2013-present, Facebook, Inc.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.