Meanwhile, these lovely folks tweeted theirs!

This week’s problem:

Given an unsorted integer array arr and an integer n, return a pair of numbers (from arr) whose product is closest to n.

Example:
closestProduct([5,3,8,2,7], 42);
> [5, 8]
 

• I'm mad it's not the last movie
• It could have used more Shuri
• It was a lot of context switching
• Marvel is a marketing genius

Interview question of the week

> fibtri(4)
>
1 
1 2 
3 5 8 
13 21 34 55

Cool things from around the internet

Chimera split keyboard
This Affordable Prefab in Spain Only Took 5 Hours to Assemble
MIT’s New Ink Can Make 3D Printed Objects Change Color
Droughts, storms and global demand tests America’s love affair with avocado​
 

function isRectangle(a, b, c, d) {
  if (a === b && a === c && a === d && c === d && b === c && b === d) 
    return true;
  else if (a === b && c === d)
    return true;
  else if (a === d && c === b)
    return true;
  else if (a === c && d === b)
    return true;
  else
    return false;
}

This week’s question:
Let’s say that you have a bunch of ropes of various lengths, and you want all of them to be the same length. You have to find the shortest one, and cut all of the ropes to be that length.
Given an int array of rope lengths, return a new array of how much each rope should be cut.

Example:
> ropeCuts([2,2,5,1,6])
> [1,1,4,0,5]
 

divisibleIntegers(n = 3, arr= [40, 50, 90])
> true // 945000 is divisible by 3

Cool things from around the internet

8 Bold Bathrooms That Don’t Back Away From Color
Bubblegum topre - BKE redux + kbdfans silencing rings
Oprah’s Golden Globes speech
 

• Got married
• Bought a house
• Released todometer
• Started this newsletter
• Spoke at Twilio Signal
• Spoke at DevRelCon Tokyo (visited Asia for the first time!)
• Spoke at the Grace Hopper conference
• Released my JavaScript and React Udemy course
• Got to around ~10k ranking in Go
• Had my first tweet with over 10k likes
• Learned how to solder
• Built a bunch of mechanical keyboards
• Played through Last Of Us, Zelda: Breath of the Wild, and a bunch of Stardew Valley
• Went outside on occasion (but for real, I think I hiked more this year than I have in my whole life)
• Started rock climbing
• Started to learn Korean (I can say blanket and sauna, what more do you need?)

Phew. What a year. I’m really proud of how much I worked on, and I’m hoping I can do even more fun things in 2018. Also, of course I’m looking forward to seeing what YOU build too. Tweet me if ever you want me to share something you’ve made, I’d love to spread the word!
 

public static Stack<Integer> sortstack(Stack<Integer> input) {
  Stack<Integer> tmpStack = new Stack<Integer>();
  while(!input.isEmpty()) {
    int tmp = input.pop();
    while(!tmpStack.isEmpty() && tmpStack.peek() > tmp) {
      input.push(tmpStack.pop());
    }
    tmpStack.push(tmp);
  }
  return tmpStack;
}

> printTree(3)
​  *
  -
 ---
-----

Cool things from around the internet

Pumphouse Point: Rugged simplicity and unrefined comfort
2017: The Year of the Blob
@paint_mixings on Instagram
This battlestation with keyboard shelves
 

function addg(a) {
  if(a === undefined) return a;
    return function g(b) {
      if(b !== undefined) {
        return addg(a+b);
      }
      return a;
    };
  }

[["I", "find", "fire", "to", "be", "dangerous", "and", "wild.",],
  ["It", "destroys", "all", "things", "in", "its", "wake."],
  ["It", "can't", "be", "tamed."],
  ["Like", "me."]] 

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Learn Calligraphy with Augmented Reality
La Muna By Oppenheim Architecture
Foodles and Hand-Lettering: A Recipe For Brilliance
A mechanical calculator
 

console.log(mul(2)(3)(4)); // output: 24 
console.log(mul(4)(3)(4)); // output: 48

Cool things from around the internet

An Ode to the Number Pi
The Pyramid Case for Planck
Mozart Trumpet (Oboe) Concerto K. 314 I Allegro Perto
Ariel​: Furniture Design
 

function majority(arr) {
var candidate = 0, // doesn't matter what this is initialized to
  count = 0,
  ret = 'none',
  arrSize = arr.length / 2;

arr.forEach((v) => { if (count === 0) { candidate = v; } if (candidate === v) { count += 1; } else { count = 0; } if (count >= arrSize) { ret = ‘majority is: ‘ + v; break; } });

return ret; }
I personally think I could do it in a more efficient way (since this is, worst case, O(n)), kind of like they’re mentioning here, but this is what I came up with so far. :)

On to this week’s question!

Given an integer array and two numbers x and y, print x numbers from the array, such that difference between any two pairs is divisible by y. If there are no x numbers, then print -1.

Example:

differencePair([1, 8, 4], 2, 3) 
> 1 4

function Queue() {
  this.q = [];

  this.peek = function() {
    return this.q[0];
  }

this.push = function(x) { this.q.push(x); }

this.pop = function () { var ret = this.q[0]; this.q.slice(1); return ret; } } Usage:

var t = new Queue()
t.push(4)
t.push(10)
t.peek()
> 4
t.pop()
> 4
t.peek()
> 10

function reachable(armLength, armOrigin, jointPosition, target) {
  let a = armOrigin[0] - target[0];
  let b = armOrigin[1] - target[1];
  let c = Math.sqrt(a*a + b*b);
  return c <= armLength;
}

I didn’t do the extra credit joint position part of the question because I was busy at the conference this week.  As you can see, without the extra credit, the jointPosition variable doesn’t matter as much. Hope you got it anyway!

This week’s question:

Implement a queue, with functions push(), pop(), and peek().
 

function duplicate(arr,n) {
  return (arr.toString() + ',').repeat(n).split(',').slice(0,-1);
}

I’m pretty proud of this answer. It turns array arr into a string, adds a comma to the end (because in JavaScript, turning arrays into strings keeps the commas), uses the string repeat() function n times, converts the resulting string back into an array by splitting it with the commas as delimiters, and then removes the last element (which will be blank because of the trailing comma).  I love one-liners!

And here’s this week’s question:

Let’s do a (sort of) inverse kinematics question. Given an int armLength, int pair armOrigin, int jointPosition, and int pair target, return a boolean true if the target is reachable by the arm.

Example:

> reachable(15, [0,0], 5, [10,10])
> true

function seatsInTheater(nCols, nRows, col, row) {
   var min = ((nCols - col + 1) * (nRows - row)) + (nCols - col);
   var o = col * (nRows - row) + (col - 1);
   if (o < min) min = o;
   return min;
}

> duplicate([1,2,3,4,5], 2); // [1,2,3,4,5,1,2,3,4,5]

Cool things from around the internet

Zebra Boat: An electric boat with a classic look
Miami Nights keycap set
The Beautiful Relationship Between Physics and Jazz
A Greek Hotel Made For Families with Little Travelers​
 

> seatsInTheater(numCols, numRows, myCol, myRow)
> 45

Cool things from around the internet

Empathy Is a Clock That Ticks in the Consciousness of Another: The Science of How Our Social Interactions Shape Our Experience of Time​
AtF Spark Font
Dasher/Dancer keycap set
This Modular Eco-Hotel Room Is Poised to Drop Into Nearly Any Setting​
 

99   98   97   96   95   94   93   92   91   90
64   63   62   61   60   59   58   57   56   89
65   36   35   34   33   32   31   30   55   88
66   37   16   15   14   13   12   29   54   87
67   38   17    4    3    2   11   28   53   86
68   39   18    5    0    1   10   27   52   85
69   40   19    6    7    8    9   26   51   84
70   41   20   21   22   23   24   25   50   83
71   42   43   44   45   46   47   48   49   82
72   73   74   75   76   77   78   79   80   81

Cool things from around the internet

Do We All See the Man Holding an iPhone in This 1937 Painting?
Duck BlackBird with GMK 9009, GMK Muted 3A/3C kit and Duck Block
What a Physicist Sees When She Looks at a Fancy Gown
Biography of Katherine Johnson, who turned 99 this week
 

    int main()
    {
         int i, n = 20;
         for (i = 0; i < n; i--)
             printf("*");
         getchar();
         return 0;
    }​

Cool things from around the internet

ErgoWing mechanical keyboard build log
Split70: an Ergonomic Split Keyboard
When Exactly Will the Eclipse Happen?
Coming Soon’s handmade infographics
 

• Introduction to Go class: As some of you know, I love the game Go! I wanted more people to play with and have been toying with making online classes (plenty of coding ones to follow, of course!), and BAM this happened. The link here gives you free access to the class (Skillshare is like Netflix for classes), check it out! I'd love any positive reviews or shares too, if you can find it in your pretty little heart.
• CSS Pickle: I'm back to working on making small fun projects with CSS based on Dribbble designs! This time around I made this happy little pickle in CSS. Making the background patterns and the bumps was a lot of trial and error, but I had fun with it!
• todometer version 1.0.4: Finally fixed some bugs I'm happy to be rid of in my open source app, todometer! If you're looking for a to-do list app on your desktop, take a look!

Interview question of the week

• The transportation system is both amazingly efficient and SUPER clean. Like, coming from living in NYC for a couple years, I thought that the transit system there was solid. And it is, but Tokyo's makes it look (and smell) like ancient times.
• Skinny jeans aren't a thing here. At least, not for women. I saw maybe 3 or 4 men with skinny jeans, but besides that, nobody wore them. I saw people wear very light and loose clothes and they very rarely stray from that (with the exception of blazers on professionals).
• All public signage is multi-lingual. It was pretty great navigating everything, because they listed almost everything in Japanese, Chinese, Korean, and English.
• The tech scene is not very community-oriented (yet). At DevRelCon Tokyo (where I was speaking, why I'm here), several professionals explained that tech conferences are almost always on the weekends (and paid, not free) because companies don't really value "extracurricular" events, even if they're work related. They're definitely working on that, though.
• Nobody seems to walk their dogs. At least not publicly. Throughout the entire trip I saw 0 dogs walking outside. There were a couple stray cats, but besides that, I saw no animals in general.

Anyway, Japan was great. I’ll definitely be back, someday!
 

> spiral(5)
 |¯¯¯¯¯
 | ¯|
 |__|

> spiral(2) // 2 is weird because it appears twice in the sequence. Handle this however you want. ¯| __|​  

Cool things from around the internet

> reverseVowels("I love burritos")
> "o livu berrotIs"

Cool things from around the internet

Before the internet
Is The Morgan Aero 8 The Most Underrated British Sports Car?
The Interactive Way to Go
4K Minimal Keyboard Wallpapers
Fun with fidget spinners and super strong magnets