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This article mainly introduces "how to use the range keyword in the Go language". In the daily operation, I believe that many people have doubts about how to use the range keyword in the Goe language. The editor has consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to use the range keyword in the Go language". Next, please follow the editor to study!

The range keyword in the Go language is used to iterate over the elements of an array (array), slice (slice), channel (channel), or collection (map) in a for loop. It returns the index of the element and the corresponding value of the index in arrays and slices, and the key-value pair in the collection.

Example

Package main

Import "fmt"

Func main () {

/ / this is the sum of a slice that we use range to find. Using an array is very similar to this.

Nums: = [] int {2,3,4}

Sum: = 0

For _, num: = range nums {

Sum + = num

}

Fmt.Println ("sum:", sum)

/ / use range on the array to pass in two variables, index and value. In the above example, we don't need to use the sequence number of the element, so we omit it with the space character "_". Sometimes we do need to know its index.

For I, num: = range nums {

If num = = 3 {

Fmt.Println ("index:", I)

}

}

/ / range can also be used on key-value pairs of map.

Kvs: = map [string] string {"a": "apple", "b": "banana"}

For k, v: = range kvs {

Fmt.Printf ("% s->% s\ n", k, v)

}

/ / range can also be used to enumerate Unicode strings. The first parameter is the index of the character, and the second is the character (the value of Unicode) itself.

For I, c: = range "go" {

Fmt.Println (I, c)

}

}

The output of the above instance is as follows:

Sum: 9index: 1a-> appleb-> banana0 1031 111111.This is the end of the study on "how to use the range keyword in Go language". I hope I can solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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