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The Elf C0de⚓︎

Elf: Ribb Bonbowford
Direct link: elfcode website
Objective: Operate the Santavator

Request⚓︎

Ribb Bonbowford

Hello - my name is Ribb Bonbowford. Nice to meet you!
Are you new to programming? It's a handy skill for anyone in cyber security.
This challenge centers around JavaScript. Take a look at this intro and see how far it gets you!
Ready to move beyond elf commands? Don't be afraid to mix in native JavaScript.
Trying to extract only numbers from an array? Have you tried to filter?
Maybe you need to enumerate an object's keys and then filter?
Getting hung up on number of lines? Maybe try to minify your code.
Is there a way to push array items to the beginning of an array? Hmm...

Hints⚓︎

Adding to Arrays

var array = [2, 3, 4]; array.push(1) doesn't do QUITE what was intended...

Getting a Key Name

In JavaScript you can enumerate an object's keys using keys, and filter the array using filter.

Filtering Items

There's got to be a way to filter for specific typeof items in an array. Maybe the typeof operator could also be useful?

Compressing JS

There are lots of ways to make your code shorter, but the number of elf commands is key.

JavaScript Primer

Want to learn a useful language? JavaScript is a great place to start! You can also test out your code using a JavaScript playground.

JavaScript Loops

Did you try the JavaScript primer? There's a great section on looping.

Solution⚓︎

Only the first 6 levels count towards solving the challenge. Bonus levels 7 and 8 are not required (but a lot of fun). Some of the scripts include additional empty lines to enhance readability, but all solutions still fit within the maximum line requirements.

Main levels

Level 1

Level 1 

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elf.moveLeft(10)
elf.moveUp(10)

Level 2

Level 1 

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elf.moveLeft(6)
var sum = elf.get_lever(0) + 2
elf.pull_lever(sum)
elf.moveLeft(4)
elf.moveUp(10)

Level 3

Level 1 

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for (var i = 0; i < lollipop.length; i++)
  elf.moveTo(lollipop[i]);

elf.moveUp(1)

Level 4

Level 1 

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for (var i = 0; i < 3; i++) {
  elf.moveLeft(3)
  elf.moveUp(12)
  elf.moveLeft(3)
  elf.moveDown(12)
}

Level 5

Level 1 

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elf.moveTo(lollipop[0])
elf.moveTo(munchkin[0])
var data = elf.ask_munch(0)
var newdata = []

for (var i = 0; i < data.length; i++)
  if (typeof data[i] === 'number') newdata.push(data[i])

elf.tell_munch(newdata)
elf.moveUp(2)

Level 6

Level 1 

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for (var i = 0; i < 4; i++)
  elf.moveTo(lollipop[i])

elf.moveTo(munchkin[0])
var data = elf.ask_munch(0)
var thekey = ''

Object.keys(data).forEach(function(key) {
  if (data[key] === "lollipop")
    thekey = key
})

elf.tell_munch(thekey)
elf.moveUp(2)

Bonus levels

Level 7

Level 1 

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function MyFilter(matrix) {
  var sum = 0
  for(var i = 0; i < matrix.length; i++)
    for(var j = 0; j < matrix[i].length; j++)
      if (typeof matrix[i][j] === 'number') sum += matrix[i][j]
  return sum
}

var funcs = [elf.moveDown, elf.moveLeft, elf.moveUp, elf.moveRight]

for (var i = 1; i <= 8; i++) {
  funcs[(i-1)%4](i)
  elf.pull_lever(i-1)
}

elf.moveUp(2)
elf.moveLeft(4)
elf.tell_munch(MyFilter) 
elf.moveUp(2)

Level 8

Level 1 

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function MyFilter(matrix) {
  var sum = 0
  var thekey = ''
  for(var i = 0; i < matrix.length; i++)
    Object.keys(matrix[i]).forEach(function(key) {
      if (matrix[i][key] === "lollipop") thekey = key
    })
  return thekey
}

var lever_sum = 0
var hor_steps = 1
var funcs = [elf.moveRight, elf.moveLeft]

for (var i = 0; i < 6; i++) {
  funcs[(i)%2](hor_steps)
  hor_steps += 2
  lever_sum += elf.get_lever(i)
  elf.pull_lever(lever_sum)
  elf.moveUp(2)
}

elf.tell_munch(MyFilter)
elf.moveRight(12)

Response⚓︎

Ribb Bonbowford

Wow - are you a JavaScript developer? Great work!
Hey, you know, you might use your JavaScript and HTTP manipulation skills to take a crack at bypassing the Santavator's S4.