在 Golang 中查找变量类型的不同方法

原文:https://www . geeksforgeeks . org/golang 中变量类型的不同查找方式/

变量是运行时可以更改的信息的占位符。和变量允许检索和操作存储的信息。 有 3 种方法可以找到 Golang 中的变量类型，如下所示:

• 使用反射。函数类型 使用反射。种类的值()函数 Using %T with Printf

  示例:

  ```go // Golang program to show the different ways // to find the Type of a Variable package main

  // import the fmt and reflect package import (     "fmt"     "reflect" )

  //main function

  func main() {

  // string type     var1 := "hello world"

  // integer     var2 := 10

  // float     var3 := 1.55

  // boolean     var4 := true

  // shorthand string array declaration     var5 := []string{"foo", "bar", "baz"}

  // map is reference datatype     var6 := map[int]string{100: "Ana", 101: "Lisa", 102: "Rob"}

  // complex64 and complex128     // is basic datatype     var7 := complex(9, 15)

  // using %T format specifier to     // determine the datatype of the variables

  fmt.Println("Using Percent T with Printf")     fmt.Println()

  fmt.Printf("var1 = %T\n", var1)     fmt.Printf("var2 = %T\n", var2)     fmt.Printf("var3 = %T\n", var3)     fmt.Printf("var4 = %T\n", var4)     fmt.Printf("var5 = %T\n", var5)     fmt.Printf("var6 = %T\n", var6)     fmt.Printf("var7 = %T\n", var7)

  // using TypeOf() method of reflect package     // to determine the datatype of the variables     fmt.Println()     fmt.Println("Using reflect.TypeOf Function")     fmt.Println()

  fmt.Println("var1 = ", reflect.TypeOf(var1))     fmt.Println("var2 = ", reflect.TypeOf(var2))     fmt.Println("var3 = ", reflect.TypeOf(var3))     fmt.Println("var4 = ", reflect.TypeOf(var4))     fmt.Println("var5 = ", reflect.TypeOf(var5))     fmt.Println("var6 = ", reflect.TypeOf(var6))     fmt.Println("var7 = ", reflect.TypeOf(var7))

  // using ValueOf() method of reflect package     // to determine the value of the variable     // Kind() method returns the datatype of the     // value fetched by the ValueOf() method     fmt.Println()     fmt.Println("Using reflect.ValueOf.Kind() Function")     fmt.Println()

  fmt.Println("var1 = ", reflect.ValueOf(var1).Kind())     fmt.Println("var2 = ", reflect.ValueOf(var2).Kind())     fmt.Println("var3 = ", reflect.ValueOf(var3).Kind())     fmt.Println("var4 = ", reflect.ValueOf(var4).Kind())     fmt.Println("var5 = ", reflect.ValueOf(var5).Kind())     fmt.Println("var6 = ", reflect.ValueOf(var6).Kind())     fmt.Println("var7 = ", reflect.ValueOf(var7).Kind())

  } ```

  输出:

  ```go Using Percent T with Printf

  var1 = string var2 = int var3 = float64 var4 = bool var5 = []string var6 = map[int]string var7 = complex128

  Using reflect.TypeOf Function

  var1 = string var2 = int var3 = float64 var4 = bool var5 = []string var6 = map[int]string var7 = complex128

  Using reflect.ValueOf.Kind() Function

  var1 = string var2 = int var3 = float64 var4 = bool var5 = slice var6 = map var7 = complex128

  ```**

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