Go language implements the method summary of string slice assignment

preface

There is a lot of string manipulation involved in all programming languages, so you can see how important it is to be familiar with string manipulation. This article details the Go language method of string slice assignment through examples.

1. In range of for cycle

func StrRangeTest() {
  str := []string{"str1", "str2", "str3"}
  for i, v := range str {
   fmt.Println(i, v)
   v = "test"
  }
  fmt.Println(str)}

Results: Assigning v does not change the value of character slice.

0 str1
1 str2
2 str3
[str1 str2 str3]

Conclusion: range is an assigned copy

2. Pass parameters in a function

func Handler() {
  strArr := []string{"str1", "str2", "str3"}
   fmt.Println("before call func:", strArr)
  strFuncTest(strArr)
  fmt.Println("after call func:", strArr)
}

func strFuncTest(strArr []string) {
  strArr[0] = "test"
}

Result: An assignment to a string slice in the function changes the value of the original slice.

[str1 str2 str3]
[test str2 str3]

Conclusion: Function parameter passing is pointer passing

conclusion

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