Go: Print with fmt cheat sheet

A format specifier is a string that contains the text you want to format plus some placeholders, called verbs, that tell the functions in the fmt package how to format your arguments.

In this example:

fmt.Printf("Hex: %x.\n", 255) // Output: "Hex: ff."

• the format specifier is "Hex: %x.\n",
• the verb %x formats 255 in base 16 notation, and
• the special value \n is a line feed.

Use the special verb %%, which consumes no argument, to write a literal percent sign:

fmt.Printf("%d %%", 50) // Output: "50 %"

Generic formatting

Argument: []int{1, 2}

Integer

Argument: 109

Boolean

Use %t to format a boolean as true or false.

Pointer

Use %p to format a pointer in base 16 notation with leading 0x.

Float

Argument: 123.456

String or byte slice

Argument: "café"

Special values

Arbitrary values can be encoded with backslash escapes. There are four different formats:

• \x followed by exactly two hexadecimal digits;
• \ followed by exactly three octal digits.
• \u followed by exactly four hexadecimal digits;
• \U followed by exactly eight hexadecimal digits;

The escapes \u and \U represent Unicode code points.

These special values can be used in any "" string literal:

fmt.Println("\\caf\u00e9") // Output: \café