feat: solve day 1 part 1

cmd/01/instruction/instruction.go

@@ -0,0 +1,40 @@
+// Package instruction provides a model for representing dial instructions
+package instruction
+
+import "strconv"
+
+type Instruction interface {
+	Direction() string
+	Distance() int
+}
+
+type instruction struct {
+	direction string
+	distance  int
+}
+
+func FromLine(line string) Instruction {
+	dir := string(line[0])
+	dist := line[1:]
+	distAsInt, _ := strconv.Atoi(dist)
+
+	return instruction{
+		direction: dir,
+		distance:  distAsInt,
+	}
+}
+
+func FromParts(direction string, distance int) Instruction {
+	return instruction{
+		direction: direction,
+		distance:  distance,
+	}
+}
+
+func (i instruction) Direction() string {
+	return i.direction
+}
+
+func (i instruction) Distance() int {
+	return i.distance
+}