Golang of Learning: Range Usage Summary

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

1. When range acts on a string, the first return value is index and the second is Char

str: = "Hello World"

for index, ch: = Range str {

FMT. Printf ("%d---%c\n", index, CH)

}

2. When range acts on an array, the first return value is index and the second is value

Func PrintArray (Array [5]int) {

for index, res: = range Array {

FMT. PRINTLN (Index, "--", RES)

}

}

Func Main () {

array: = [5]int{1,2,3,4,5}

PrintArray (Array)

}

3. When range is acting on slice, the first return value is index and the second is value

Arr: = [10]int {1,2,3,4,5,6,7,8,9,10}

var Slice1 []int = Arr[:5]

For _, Res: = Range Slice1 {

FMT. Println (RES)

}

4, this is not a range of the use of the map, the first value of the return values, the second time is OK

Type person struct {

ID String

Name String

Addr String

}

Func Main () {

var persons map[string] person = do (map[string] person)

persons["123"] = person {"123", "Heihei", "haha"}

p, OK: = persons["123"]

if OK {

FMT. Println (P.name)

}

...