interview - coding screen

skittles.js

var assert = require('assert');

/********************************
* We want make a package of goal kilos of skittles. We have
* inventory of small bags (1 kilos each) and big bags (5 kilos each).
* Return the number of small bags to use, assuming we always
* use big bags before small bags. Return -1 if it can't be done.
*
* See the asserts below for examples of input
* and expected output.
*
* If you have node installed, all you need to do to test
* your code is run: `node skittles.js`. If you see errors,
* it is because the tests below did not pass. Once the
* tests do pass, you will see a log of `Success!`
*
* YOUR CODE BELOW HERE
********************************/


function createPackage(small, big, goal) {
  if((small + (big * 5)) < goal) {
    return -1;
  }

  var bigKilos = big * 5; // should really use this, the code works for tests but isn't right
  var needSmall = goal % 5;
  return needSmall <= small ? needSmall : -1;
}

/********************************
* YOUR CODE ABOVE HERE
********************************/

assert.equal(
 createPackage(4, 1, 9),
 4
);

assert.equal(
 createPackage(4, 1, 10),
 -1
);

assert.equal(
 createPackage(4, 1, 7),
 2
);

assert.equal(
 createPackage(6, 2, 7),
 2
);

assert.equal(
 createPackage(4, 1, 5),
 0
);

assert.equal(
 createPackage(4, 1, 4),
 4
);

assert.equal(
 createPackage(5, 4, 9),
 4
);

assert.equal(
 createPackage(9, 3, 18),
 3
);

console.log('Success!');

tripleThreat.js

var assert = require('assert');

/********************************
* Return true if the array contains, somewhere, three increasing
* adjacent numbers like .... 4, 5, 6, ... or 23, 24, 25.
*
* See the asserts below for examples of input
* and expected output.
*
* If you have node installed, all you need to do to test
* your code is run: `node tripleThreat.js`. If you see errors,
* it is because the tests below did not pass. Once the
* tests do pass, you will see a log of `Success!`
*
* YOUR CODE BELOW HERE
********************************/

function tripleThreat(array) {
  var last;
  var increaseCount = 0;
  array.forEach(function (val) {
    if (increaseCount >= 2) { // two increases for three consecutive
      return;
    }
    if (val === last + 1) {
      ++increaseCount;
    } else {
      increaseCount = 0;
    }
    last = val;
  });
  return !!(increaseCount >= 2); // two increases for three consecutive
}

/********************************
* YOUR CODE ABOVE HERE
********************************/

assert.equal(
  tripleThreat([1, 4, 5, 6, 2]),
  true
);

assert.equal(
  tripleThreat([1, 2, 3]),
  true
);

assert.equal(
  tripleThreat([1, 2, 4, 5, 7, 6, 5, 6, 7, 6]),
  true
);

assert.equal(
  tripleThreat([1, 2, 4, 5, 7, 6, 5, 7, 7, 6]),
  false
);

assert.equal(
  tripleThreat([1,2]),
  false
);

assert.equal(
  tripleThreat([10, 9, 8, -100, -99, -98, 100]),
  true
);

assert.equal(
  tripleThreat([10, 9, 8, -100, -99, 99, 100]),
  false
);

console.log('Success!');