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| const input = ["L68", "L30", "R48", "L5", "R60", "L55", "L1", "L99", "R14", "L82"]; | |
| let pointer = 50; | |
| const result = input | |
| .map((instruction) => { | |
| const direction = instruction.charAt(0); | |
| const distance = parseInt(instruction.slice(1), 10); | |
| return { direction, distance }; | |
| }) | |
| .reduce((acc, { direction, distance }) => { | |
| const toMove = distance % 100; | |
| let zerosCounted = (distance - toMove) / 100; | |
| switch (direction) { | |
| case "L": | |
| zerosCounted += pointer - toMove < 0 ? 1 : 0; | |
| tmp = pointer - toMove < 0 ? Math.abs(pointer - toMove) : pointer - toMove; | |
| break; | |
| case "R": | |
| zerosCounted += pointer + toMove > 100 ? 1 : 0; | |
| tmp = (pointer + toMove) % 100; | |
| break; | |
| } | |
| return acc + zerosCounted; | |
| }, 0); |
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