utils

Documentation

Index

• Variables
• func Check(e error, format string, a ...any)
• func CountBits(n uint32) int
• func Gcd(a, b int64) int64
• func Lcm(a, b int64) int64
• func OCRLetters(message string) string
• func ReadLines(r io.Reader) []string
• type Point
  • func (p Point) Add(p2 Point) Point
  • func (p Point) Left() Point
  • func (p Point) Manhattan() int
  • func (p Point) Right() Point
  • func (p Point) Scale(factor int) Point

Variables

var Directions = []Point{North, South, East, West}

Slice of cardinal directions

var East = Point{1, 0}

+X direction

var North = Point{0, 1}

+Y direction

var South = Point{0, -1}

-Y direction

var Verbose bool

Verbose flag. Use pflag.Parse() in main() to populate.

var West = Point{-1, 0}

-X direction

Functions

func Check

func Check(e error, format string, a ...any)

Check if error is not nil and panic with message if it is.

func CountBits

func CountBits(n uint32) int

Kernighan's Bit Counting Algorithm

func Gcd

func Gcd(a, b int64) int64

Greatest Common Denominator

func Lcm

func Lcm(a, b int64) int64

Least Common Multiple

func OCRLetters

func OCRLetters(message string) string

Convert Advent of Code height 6 font letters to a string. The message must be represented as 6 rows of # and . characters separated by newlines.

func ReadLines

func ReadLines(r io.Reader) []string

Read all lines from reader. Panic if there is an issue

Types

type Point

type Point struct {
	X int
	Y int
}

2-D Point

func (Point) Add

func (p Point) Add(p2 Point) Point

Return the sum of two points

func (Point) Left

func (p Point) Left() Point

Turn point left 90 degrees

func (Point) Manhattan

func (p Point) Manhattan() int

Return metropolis magnitude (abs(x)+abs(y))

func (Point) Right

func (p Point) Right() Point

Turn point right 90 degrees

func (Point) Scale

func (p Point) Scale(factor int) Point

Multiply point by a scalar