golang

Go Language Practices

Golang Types

Numbers

Integers

Unsigned Integers (no negatives)

• uint8 / byte (0 - 255)
• uint16 (0 - 65535)
• uint32 (0 - 4294967295)
• uint64 (0 to 18446744073709551615)

Signed Integers

• int8 (-128 to 127)
• int16 (-32768 to 32767)
• int32 / rune (-2147483648 to 2147483647)
• int64 (-9223372036854775808 to 9223372036854775807)

Machine Dependent Types

• uint (32 or 64 bits)
• int (same size as uint)
• uintptr (an unsigned integer to store the uninterpreted bits of a pointer value)

Floating Point Numbers

Floats

• float32 (IEEE-754 32-bit floating-point numbers)
• float64 (IEEE-754 64-bit floating-point numbers)

Complex (Imaginary Parts)

• complex64 (Complex numbers with float32 real and imaginary parts)
• complex128 (Complex numbers with float64 real and imaginary parts)

Strings

• "Hello World"

Boleans

• true
• false

FMT Cheat Sheet

General

• %v (value in default format)
• %T (type)
• %% (literal %)

Boolean

• %t (true or false)

Integer

• %b (base 2)
• %o (base 8)
• %d (base 10)
• %x (base 16)

Floating Points

• %e (scientific notation)
• %f / %F (decimal no exponent)
• %g (for large exponents)

Strings

• %s (default)
• %q (double quoted string)

Width & Percision

• %f (default width, default precision)
• %9f (width 9, default precision)
• % 2f (default width precision 2f)
• %9.2f (width 9, precision 2)
• %9.f (width 9, precision 0)

Padding

• %08d (pads digit to length 9 with preceeding 0's)
• %-4d (Pads with spaces (width 4, left justified))

Methods

• Sprintf() format without printing
• Printf() format with printing