Constants and Formatting Cheatsheet

Constants Summary

• Declare: const Name = "Value"
• Rules: Cannot use :=, must be known at compile time.
• Computed: const result = 10 * 5 is valid; const time = time.Now() is NOT.

Formatting Verbs Reference

Verb	Usage	Example
%v	Any value	"Value: %v"
%T	Type	float64, string
%s	String	"Hello %s"
%d	Integer	"ID: %d"
%f	Float	3.141590
%.2f	Rounded Float	3.14
%t	Boolean	true/false

Functions

• fmt.Printf(): Prints to standard output.
• fmt.Sprintf(): Returns the formatted string.

Encoding & Runes

• UTF-8: The default encoding for Go strings.
• byte (uint8): Raw 8-bit data.
• rune (int32): A single Unicode character (code point).
• Length: len(s) returns byte count; utf8.RuneCountInString(s) returns character count.