Go Learning notes: Range function

This is a creation in Article, where the information may have evolved or changed.

The range function is a magical and interesting built-in function that you can use to iterate through arrays, slices, and dictionaries.

When used to iterate over arrays and slices, the range function returns indexes and elements;

package mainimport  "FMT" Func main ()  {    //  Here we use range to calculate all the elements of a slice and     //  this method applies to the array     nums := [] Int{2, 3, 4}    sum := 0    for _, num  := range nums {        sum += num     }    fmt. Println ("Sum:",  sum)     // range  returns index and element values when used to iterate over arrays and slices      //  If we don't care the index can use an underscore (_) to ignore this return value     //  of course we sometimes need this index      for i, num := range nums {         If num == 3 {            fmt. Println ("index:",  i)         }    }&NBsp;   //  returns a key-value pair when using range to traverse the dictionary.     kvs := map[string]string{"A":  "Apple",  "B":  "banana"}     for k, v := range kvs {         fmt. Printf ("%s -> %s\n",  k, v)     }    //  The range function returns a Unicode code point when it is used to traverse a string.     //  The first return value is the index of the starting byte of each character, and the second is the character code point,    //  because the string of go is made up of bytes, Multiple bytes form a rune type character.     for i, c := range  "Go"  {         fmt. Println (I, c)     }}

The output result is

SUM:9INDEX:1A, Appleb, banana0 1031 111