sghall

function nestedParens(s) {
  let open = 0;

  for (let i = 0; i < s.length; i++) {
    if (s[i] === '(') {
      open += 1;
    } else if (s[i] === ')') {
      open -= 1;
    }

sghall

const merge = (arrL, arrR) => {
  const result = [];

  let cursorL = 0;
  let cursorR = 0;

  while (cursorL < arrL.length && cursorR < arrR.length) {
    if (arrL[cursorL] < arrR[cursorR]) {
      result.push(arrL[cursorL++]);

sghall

const swap = (arr, index1, index2) => {
  [arr[index1], arr[index2]] = [arr[index2], arr[index1]];
};

const bubbleSort = (arr) => {
  const len = arr.length;

  for (let i = 0; i < len; i++) {
    for (let j = 0, k = len - 1 - i; j < k; j++) {
      if (arr[j] > arr[j + 1]) {

sghall

const insertionSort = arr => {
  const len = arr.length;
  let i, j, temp;
  
  for (i = 1; i < len; i++) {
    j = i;
    temp = arr[i];
    
    while (j > 0 && arr[j - 1] > temp) {
      arr[j] = arr[j - 1];

sghall

function isPrime(num) {

  for (var i = 2; i < Math.sqrt(num); i++) {
    if (num % i === 0) return false;
  }

  return true;          
}
 

sghall

//DFS
Tree.prototype.traverse = function (callback) {
  var stack=[this];
  var n;

  while(stack.length>0) {

    n = stack.pop();
    callback(n.value);

sghall

function fizzBuzz(num) {

  for (let i = 1; i <= num; i++) {
    const fizz = i % 3 === 0 ? 'Fizz': '';
    const buzz = i % 5 === 0 ? 'Buzz': '';
 
    console.log(fizz || buzz ? fizz + buzz: i)
  }
  
};

sghall

function sqrt(num, guess) {
  guess = guess || num / 3;

  if (Math.abs(num - guess * guess) < 5e-15) {
    return guess;
  } else {
    return sqrt(num, (num / guess + guess) / 2);
  }
};

sghall

//Blog post with working examples: http://www.delimited.io/blog/2013/12/19/force-bubble-charts-in-d3
d3.csv('data/fuel.csv', function (error, data) {

  var width = 1000, height = 1000;
  var fill = d3.scale.ordinal().range(['#827d92','#827354','#523536','#72856a','#2a3285','#383435'])
  var svg = d3.select("#chart").append("svg")
      .attr("width", width)
      .attr("height", height);

  _.each(data, function (elem) {

sghall

// See blog post for full details http://www.delimited.io/blog/2013/12/1/hexbins-with-d3-and-leaflet-maps
//**********************************************************************************
//********  LEAFLET HEXBIN LAYER CLASS *********************************************
//**********************************************************************************
L.HexbinLayer = L.Class.extend({
  includes: L.Mixin.Events,
  initialize: function (rawData, options) {
    this.levels = {};
    this.layout = d3.hexbin().radius(10);
    this.rscale = d3.scale.sqrt().range([0, 10]).clamp(true);