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Today, the editor will share with you the relevant knowledge points about how to use the range keyword in Go language. The content is detailed and the logic is clear. I believe most people still know too much about this, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

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.

Instance 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 is all the content of this article "how to use the range keyword in Go language". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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