Daniel-Hug

function runningSum(addends) {
  var sums = [addends[0]];
  for (var i=1; i<addends.length; i++) {
    sums.push(addends[i]);
  }
  return sums;
}

Daniel-Hug

/*
	usage:

	var csvString = toCSV({
		key1: { col1: 5, col2: 'hi' },
		key2: { col1: 7, col2: 'hello' }
	}, {
		// default config:
		includeKeys: true,
		delimiter: ',',

Daniel-Hug

// Zip arrays into one
// Example with two arrays: value 0 from a, value 0 from b, value 1 from a, etc.
function zipArrays() {
  var zipped = [];
  var arrays = [].slice.call(arguments);
  for (var valueI = 0; arrays.length > 0; valueI++) {
    for (var arrayI = 0; arrayI < arrays.length; arrayI++) {
      if (arrays[arrayI].length - 1 < valueI) {
        arrays.splice(arrayI, 1);
        continue;

Daniel-Hug

/* differentiate nested <mark> elements with a gamut of colors */
mark {
	color: #000;
	transition: background-color 0.2s ease-in;
}

mark,
mark:hover,
mark:hover mark {
	background: hsl(0, 100%, 90%);

Daniel-Hug

function getProperties(obj) {
	var newObj = {};
	for (var key in obj) {
		newObj[key] = true;
	}
	return newObj;
}

function haveSameProperties(a, b) {
	return JSON.stringify(getProperties(a)) === JSON.stringify(getProperties(b));

Daniel-Hug

function getGaps(nums) {
	var gaps = [];
	for (var i = 1; i < nums.length; i++) {
		gaps.push(nums[i] - nums[i-1]);
	}
	return gaps;
}

Daniel-Hug

function getRunLengths(array) {
  var runLengths = [];
  var curValue;
  for (var i = 0; i < array.length; i++) {
    if (array[i] === curValue) {
      runLengths[runLengths.length - 1]++;
    }
    else {
      runLengths.push(1);
      curValue = array[i];

Daniel-Hug

var log = (function() {
	function qs(selector, scope) {
		return (scope || document).querySelector(selector);
	}

	var log = qs('#log');

	return function(msg) {
		var p = document.createElement('p');
		p.style.whiteSpace = 'pre';

Daniel-Hug

function displayProps(obj, indent) {
	indent = indent || '\t';
	var str = ({}).toString.call(obj).slice(8,-1) + ':\n';
	for (var key in obj) {
		var val = typeof obj[key] === 'object' ?
			displayProps(obj[key], indent + '\t') : obj[key];
		str += indent + key + ': ' + val + '\n';
	}
	return str;
}

Daniel-Hug

// create 2d array or multidimensional matrix
function createMatrix() {
	var matrix = [];
	matrix.add = function(val, i1, i2/*, ...*/) {
		var cur = matrix, curI;

		// loop from 2nd argument to 2nd to last
		for (var i = 1; i < arguments.length - 1; i++) {
			curI = arguments[i];