Go by Example:range

Use range to traverse elements in a variety of data structures. Let's see how to use range to traverse some of the data structures we've already learned.

Package Mainimport "FMT" Func Main () {//    here we use range traversal slice to sum    //This method is also applicable to the array.    nums: = []int{2, 3, 4}    sum: = 0 for    _, num: = range nums {        sum + = num    }    fmt. Println ("sum:", sum)    //range is used to iterate through arrays and slices, returning index and element value (value).    If we don't care, the index can use a null-value definition (_) to ignore this return value    //And we sometimes need this index.    for i, num: = Range nums {        if num = = 3 {            FMT. Println ("Index:", i)        }    }    //When using range to traverse the dictionary, return the key-value pair (key/value).    KVS: = map[string]string{"A": "Apple", "B": "Banana"}    for K, V: = range KVS {        fmt. Printf ("%s-%s\n", K, V)    }    //The range function is used to iterate through a string, returning a Unicode code point. The    first return value is the index of the starting byte of each character, and the second is the Rune character.    for I, c: = Range "Go" {        fmt. Println (i, C)    }}

Output

$ go Run range.go sum:9index:1a, Appleb, banana0 1031 111

Next example: Go by Example:functions.

English original

Go by Example:range