Strings
Strings function
package main
import (
"fmt"
s "strings"
)
func main() {
/* Need to import strings as s */
fmt.Println(s.Contains("test", "e"))
/* Build in */
fmt.Println(len("hello")) // => 5
// Outputs: 101
fmt.Println("hello"[1])
// Outputs: e
fmt.Println(string("hello"[1]))
}
fmt.Printf
package main
import (
"fmt"
"os"
)
type point struct {
x, y int
}
func main() {
p := point{1, 2}
fmt.Printf("%v\n", p) // => {1 2}
fmt.Printf("%+v\n", p) // => {x:1 y:2}
fmt.Printf("%#v\n", p) // => main.point{x:1, y:2}
fmt.Printf("%T\n", p) // => main.point
fmt.Printf("%t\n", true) // => TRUE
fmt.Printf("%d\n", 123) // => 123
fmt.Printf("%b\n", 14) // => 1110
fmt.Printf("%c\n", 33) // => !
fmt.Printf("%x\n", 456) // => 1c8
fmt.Printf("%f\n", 78.9) // => 78.9
fmt.Printf("%e\n", 123400000.0) // => 1.23E+08
fmt.Printf("%E\n", 123400000.0) // => 1.23E+08
fmt.Printf("%s\n", "\"string\"") // => "string"
fmt.Printf("%q\n", "\"string\"") // => "\"string\""
fmt.Printf("%x\n", "hex this") // => 6.86578E+15
fmt.Printf("%p\n", &p) // => 0xc00002c040
fmt.Printf("|%6d|%6d|\n", 12, 345) // => | 12| 345|
fmt.Printf("|%6.2f|%6.2f|\n", 1.2, 3.45) // => | 1.20| 3.45|
fmt.Printf("|%-6.2f|%-6.2f|\n", 1.2, 3.45) // => |1.20 |3.45 |
fmt.Printf("|%6s|%6s|\n", "foo", "b") // => | foo| b|
fmt.Printf("|%-6s|%-6s|\n", "foo", "b") // => |foo |b |
s := fmt.Sprintf("a %s", "string")
fmt.Println(s)
fmt.Fprintf(os.Stderr, "an %s\n", "error")
}
See also: fmt
Function examples
| Example | Result |
|---|---|
| Contains("test", "es") | true |
| Count("test", "t") | 2 |
| HasPrefix("test", "te") | true |
| HasSuffix("test", "st") | true |
| Index("test", "e") | 1 |
| Join([]string{"a", "b"}, "-") | a-b |
| Repeat("a", 5) | aaaaa |
| Replace("foo", "o", "0", -1) | f00 |
| Replace("foo", "o", "0", 1) | f0o |
| Split("a-b-c-d-e", "-") | [a b c d e] |
| ToLower("TEST") | test |
| ToUpper("test") | TEST |