IndexOf

IndexOf

https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/String/indexOf

The IndexOf() method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex. Returns -1 if the value is not found.

Syntax: IndexOf(str, searchStr string, [, fromIndex int]) int

str := "hello world"

fmt.Println(gstr.IndexOf(str, "")) // => 0

fmt.Println(gstr.IndexOf(str, "", 0)) // => 0

fmt.Println(gstr.IndexOf(str, "", 3)) // => 3

fmt.Println(gstr.IndexOf(str, "", 8)) // => 8

fmt.Println(gstr.IndexOf(str, "", 11)) // => 11

fmt.Println(gstr.IndexOf(str, "", 13)) // => 11

fmt.Println(gstr.IndexOf(str, "", 22)) // => 11

str = "Blue Whale"

fmt.Println(gstr.IndexOf(str, "Blue")) // => 0

fmt.Println(gstr.IndexOf(str, "Blute")) // => -1

fmt.Println(gstr.IndexOf(str, "Whale", 0)) // => 5

fmt.Println(gstr.IndexOf(str, "Whale", 5)) // => 5

fmt.Println(gstr.IndexOf(str, "", -1)) // => 0

fmt.Println(gstr.IndexOf(str, "", 9)) // => 9

fmt.Println(gstr.IndexOf(str, "", 10)) // => 10

fmt.Println(gstr.IndexOf(str, "", 11)) // => 10

fmt.Println(gstr.IndexOf(str, "blue")) // => -1