Slide Code Challenge

gistfile1.js

// Write a function, that checks whether the bomb explodes if the wires are cut in a given order.
//
// It should take an array of strings (colors of wires) as input and return a single boolean value
// as output (true if bomb explodes, false otherwise).
//
// Example of an input:
// ['red', 'green', 'blue', 'yellow', 'white', 'black']
//
// Rules
// - After cutting the red wire, you can't cut the yellow one next.
// - After cutting the black wire, you can only cut the blue or green one.
// - When cutting the white wire, you have to cut yellow, blue, black or red wire next.
// - If you cut the blue wire, you have to cut the red one next.
// - After cutting the yellow wire, you can't cut the black or white one.

const wireCombinations = {
    red: {
      nextMustBe: [],
      nextCannotBe: ['yellow']
    },
    black: {
      nextMustBe: ['blue', 'green'],
      nextCannotBe: []
    },
    white: {
      nextMustBe: ['yellow', 'blue', 'black', 'red'],
      nextCannotBe: []
    },
    blue: {
      nextMustBe: ['red'],
      nextCannotBe: []
    },
    yellow: {
      nextMustBe: [],
      nextCannotBe: ['black', 'white'],
    }
  };

(wires) => {
  let hasExploded = false;

  for (var i = 0; i < wires.length; i++) {
    const wireColor = wires[i];
    const wireColorData = wireCombinations[wireColor];

    // If color has no dedicated rules then skip.
    if (wireColorData === undefined) continue;

    // If there is no further wire then skip.
    const nextWireColor = wires[i + 1];
    if (nextWireColor === undefined) continue;

    // If next wire is in the deny list, break early.
    if (wireColorData.nextCannotBe.includes(nextWireColor)) {
      hasExploded = true;
      break;
    }

    // If there is a required color to be next, and the next wire isn't there, break early.
    if (wireColorData.nextMustBe.length > 0 && wireColorData.nextMustBe.includes(nextWireColor) === false) {
      hasExploded = true;
      break;
    }
  }

  return hasExploded;
}