iFit

chocolate.js

var assert = require('assert');

/********************************
* We want make a package of goal kilos of chocolate. We have
* inventory of small bars (1 kilos each) and big bars (5 kilos each).
* Return the number of small bars to use, assuming we always
* use big bars before small bars. 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 chocolate.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 makeChocolate(small, big, goal) {
  // Constant sizes
  var BIGKG = 5, SMALLKG = 1;

  // Accumulators
  var bigsNeeded = 0, smallsNeeded = 0;

  // Check to see that we have enough chocolate to meet the goal
  if ((small * SMALLKG) + (big * BIGKG) < goal) {
    return -1; // we don't have enough chocolate!
  }

  while (goal > 0) {
    if (goal / BIGKG >= 1 && big > 0) {
      goal -= BIGKG;
      bigsNeeded ++;
      big --;
    }
    else if (goal / SMALLKG >= 1 && small > 0) {
      goal -= SMALLKG;
      smallsNeeded ++;
      small --;
    }
  }

  // sanity check
  if (goal !== 0) {
    throw new Error('something went wrong');
  }

  return smallsNeeded;
}

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

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

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

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

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

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

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

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

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

console.log('Success!');

tripleUp.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 tripleUp.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 tripleUp(array) {
  for (var i = 0; i < array.length - 2; i ++) {
    // Look ahead at the next two numbers to check for a sequence
    if ((array[i] === array[i + 1] - 1) && (array[i] === array[i + 2] -2)) {
      return true;
    }
  }
  return false;
}

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

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

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

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

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

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

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

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

console.log('Success!');