Gregoor

const parseSantaRoute = (str, roboMode = false) => {
  const charFns = {
    '^': (x, y) => [x    , y + 1],
    'v': (x, y) => [x    , y - 1],
    '>': (x, y) => [x + 1, y    ],
    '<': (x, y) => [x - 1, y    ]
  };
  
  let error;
  let position = [0, 0];

Gregoor

const calcPaper = (l, w, h) => {
  const sides = [l * w,  w * h, h * l];
  return Math.min(...sides) + sides.reduce((n, v) => n + 2 * v, 0);
};

const calcRibbon = (...dimensions) => {
  const max = Math.max(...dimensions);
  return 2 * dimensions.filter(n => n !== max).reduce((n, v) => n + v, 0) +
  	dimensions.reduce((n, v) => n * v, 1);
}

Gregoor

const parseFloor = (str) => {
  const floorCharFns = {
    '(': n => n + 1,
    ')': n => n - 1
  };
  let floor = 0;
  let error;
  let firstBasementPos;
  for (let i = 0; i < str.length; i++) {
    const char = str[i];

Gregoor

import 'package:benchmark_harness/benchmark_harness.dart';
import 'dart:math';

void main() {
  var keyFn = (n) {
        var sum = n % 9;
        if (sum == 0 && n > 0) sum = 9;
        return sum;
      },
      compFn = (n1, n2) => keyFn(n1).compareTo(keyFn(n2));