# Condition
condition包含一些用于条件判断的函数。这个包的实现参考了carlmjohnson的truthy包的实现，更多有用的信息可以在[truthy](https://github.com/carlmjohnson/truthy)中找到，感谢carlmjohnson。

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## 源码:

- [https://github.com/duke-git/lancet/blob/main/condition/condition.go](https://github.com/duke-git/lancet/blob/main/condition/condition.go)

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## 用法:
```go
import (
    "github.com/duke-git/lancet/v2/condition"
)
```

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## Index

- [Bool](#Bool)
- [And](#And)
- [Or](#Or)
- [Xor](#Generate)
- [Nor](#Nor)
- [Nand](#Nand)
- [TernaryOperator](#TernaryOperator)

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## 目录

### <span id="Bool">Bool</span>
<p>返回传入参数的bool值.<br/>
如果出入类型参数含有Bool方法, 会调用该方法并返回<br/>
如果传入类型参数有IsZero方法, 返回IsZero方法返回值的取反<br/>
slices和map的length大于0时，返回true，否则返回false<br/>
其他类型会判断是否是零值</p>

<b>函数签名:</b>

```go
func Bool[T any](value T) bool
```
<b>例子:</b>

```go
package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/condition"
)

func main() {
	// bool
	fmt.Println(condition.Bool(false)) // false
	fmt.Println(condition.Bool(true)) // true

	// integer
	fmt.Println(condition.Bool(0)) // false
	fmt.Println(condition.Bool(1)) // true

	// float
	fmt.Println(condition.Bool(0.0)) // false
	fmt.Println(condition.Bool(0.1)) // true

	// string
	fmt.Println(condition.Bool("")) // false
	fmt.Println(condition.Bool(" ")) // true
	fmt.Println(condition.Bool("0")) // true

	// slice
	var nums [2]int
	fmt.Println(condition.Bool(nums)) // false
	nums = [2]int{0, 1}
	fmt.Println(condition.Bool(nums)) // true

	// map
	fmt.Println(condition.Bool(map[string]string{})) // false
	fmt.Println(condition.Bool(map[string]string{"a": "a"})) // true

	// struct
	fmt.Println(condition.Bool(struct{}{})) // false
	fmt.Println(condition.Bool(time.Now())) // true
}
```



### <span id="And">And</span>
<p>逻辑且操作，当切仅当a和b都为true时返回true</p>

<b>函数签名:</b>

```go
func And[T, U any](a T, b U) bool
```
<b>例子:</b>

```go
package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/condition"
)

func main() {
	fmt.Println(condition.And(0, 1)) // false
	fmt.Println(condition.And(0, "")) // false
	fmt.Println(condition.And(0, "0")) // false
	fmt.Println(condition.And(1, "0")) // true
}
```



### <span id="Or">Or</span>
<p>逻辑或操作，当切仅当a和b都为false时返回false</p>

<b>函数签名:</b>

```go
func Or[T, U any](a T, b U) bool
```
<b>例子:</b>

```go
package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/condition"
)

func main() {
	fmt.Println(condition.Or(0, "")) // false
	fmt.Println(condition.Or(0, 1)) // true
	fmt.Println(condition.Or(0, "0")) // true
	fmt.Println(condition.Or(1, "0")) // true
}
```



### <span id="Xor">Xor</span>
<p>逻辑异或操作，a和b相同返回false，a和b不相同返回true</p>

<b>函数签名:</b>

```go
func Xor[T, U any](a T, b U) bool
```
<b>例子:</b>

```go
package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/condition"
)

func main() {
	fmt.Println(condition.Xor(0, 0)) // false
	fmt.Println(condition.Xor(0, 1)) // true
	fmt.Println(condition.Xor(1, 0)) // true
	fmt.Println(condition.Xor(1, 1)) // false
}
```



### <span id="Nor">Nor</span>
<p>异或的取反操作</p>

<b>函数签名:</b>

```go
func Nor[T, U any](a T, b U) bool
```
<b>例子:</b>

```go
package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/condition"
)

func main() {
	fmt.Println(condition.Nor(0, 0)) // true
	fmt.Println(condition.Nor(0, 1)) // false
	fmt.Println(condition.Nor(1, 0)) // false
	fmt.Println(condition.Nor(1, 1)) // true
}
```



### <span id="Nand">Nand</span>
<p>如果a和b都为真，返回false，否则返回true</p>

<b>函数签名:</b>

```go
func Nand[T, U any](a T, b U) bool
```
<b>例子:</b>

```go
package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/condition"
)

func main() {
	fmt.Println(condition.Nand(0, 0)) // true
	fmt.Println(condition.Nand(0, 1)) // true
	fmt.Println(condition.Nand(1, 0)) // true
	fmt.Println(condition.Nand(1, 1)) // false
}
```



### <span id="TernaryOperator">TernaryOperator</span>
<p>三元运算符</p>

<b>函数签名:</b>

```go
func TernaryOperator[T, U any](isTrue T, ifValue U, elseValue U) U
```
<b>例子:</b>

```go
package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/condition"
)

func main() {
	trueValue := "1"
	falseValue := "0"

	fmt.Println(condition.TernaryOperator(true, trueValue, falseValue)) // "1"
}
```