jpiccari’s gists

jpiccari / metadata.js

Last active December 20, 2015 22:58

Weekend puzzle. Recursively generates all possible vowel combinations in the word metadata. The main function, dfs(), is basically a DFS but instead of exploring unexplored adjacent nodes we explore all nodes in 'set' while watching our current tree depth to figure out when we have enough vowels to generate a new result. (310 bytes; 190 bytes mi…

	var result = [];
	(function dfs(set, len, stack) {
	if(len === 0)
	return result.push(Array.prototype.map.call('metadata', function(x, i) {
	return i%2 ? stack[i>>1] : x;
	}).join(''));

	for(var i = 0; i < set.length; dfs(set, len-1, (stack \|\| []).concat(set[i++])));
	}(['a', 'e', 'i', 'o', 'u', 'y'], 4))

jpiccari / bwrite.sh

Last active January 3, 2016 02:29

I found myself updating a few bytes within files often. This script quickly allows the update of 1 or more bytes so I don't have to open a hex editor for such a simple task.

	#!/bin/sh

	if [ "$#" -ne 3 ] \|\| ! [ -f "$1" ]; then
	# usage
	echo "$(basename $0) [file] [offset] [bytes]"
	exit 1
	fi

	bytes=$(printf "$3" \| xxd -p)
	printf $bytes \| xxd -r -p \| dd of="$1" seek=$(( $2 )) count=$(( ${#bytes} / 2 )) bs=1 conv=notrunc &> /dev/null

jpiccari / gist:8622410

Last active January 4, 2016 12:39

Simple function to dynamically create an array of a given length where the values are equal to the indices. (407 bytes; 87 bytes minified)

	/**
	* Creates an array in which each value stored in the array represets the value's index (zero-based).
	* @param {number} len - Length of array to produce.
	* @returns {array} The resulting array.
	*/
	function arrayOfNumbers(len) {
	/*
	* You could replace Number with eval and save 2 additional bytes,
	* however that is less secure and probalby not worth the 2 bytes.
	*

jpiccari / EventEmitter.js

Last active August 29, 2015 14:01

AMD EventEmitter module that supports event filters (a.k.a namespaced events). Extends object passed to constructor. There is also a global emitter accessible via EventEmitter.global. (565 bytes minified, gzipped)

	define(
	'EventEmitter',
	function() {
	'use strict';

	/**
	* Parse event types into topic and filters.
	*/
	function parseEvent(event) {
	event = event.split('.');

jpiccari / Observer.js

Last active August 29, 2015 14:01

AMD Observer module, depends on EventEmitter (see my other gists). (235 bytes minified, gzipped)

	define(
	'Observer',
	[
	'EventEmitter'
	],
	function(EventEmitter) {
	'use strict';

	function copyValue(value) {
	if (typeof value === 'object') {

jpiccari / observer.v2.js

Last active August 29, 2015 14:01

An improved observer that tracks changes to existing object properties while still allowing native object access. Should be supported in IE8+, Firefox, Chrome, Safari, etc. (235 bytes minified, gzipped)

	define(
	'observer',
	[
	'EventEmitter'
	],
	function(EventEmitter) {
	'use strict';

	var OBSERVER_KEY = '_isObserver',
	isStandardDefineProperties = true;

jpiccari / RequirejsInfo.js

Last active April 26, 2024 23:11

Chrome Snippets

	(function() {
	var moduleList = []
	module,
	key;

	if (typeof requirejs !== 'undefined') {
	console.groupCollapsed('%cRequire.js v%s module list', 'color: #0080ff; font: 1.4em Menlo, monospace', requirejs.version);
	for (key in requirejs.s.contexts._.defined) {
	module = requirejs.s.contexts._.defined[key];
	moduleList.push({

jpiccari / constructorFactory.js

Last active August 29, 2015 14:02

Factory for creating constructors that don't require new keywords with minimal boilerplate.

	/**
	* Factory to take some of the boilerplate out of creating constructors
	* which instantiate objects even without the new keyword.
	* @param {function} fn - Input function to create constructor from.
	* @returns The updated constructor.
	*/
	function constructorFactory(fn) {
	if (typeof fn !== 'function') {
	throw new TypeError('Expected function!');
	}

jpiccari / gist:027e83ca507a06515e41

Last active August 29, 2015 14:02

Created this function to help determine how much to contribute (annually) to my 401(k) to retire a decamillionaire.

	/**
	* Calculate the annual contributions required to reach a desired future value.
	* @param {number} P - Current principle value.
	* @param {number} FV - Desired future value.
	* @param {number} r - Rate of return.
	* @param {number} Y - Years of growth.
	* @returns {number} Annual contribution.
	*/
	function annualContributions(P, FV, r, Y) {
	var z = 1 + r;

jpiccari / formatString.js

Created June 29, 2014 20:32

	/**
	* Creates a string using indexed format string
	* @param {string} Format of string
	* @param {...string} One or more strings to be using in the format
	*/
	function formatString(/* ... */) {
	var args = Array.apply(0, arguments);
	return args.shift().replace(/\{(\d+)\}/g, function(match, index) {
	return index < args.length
	? args[index]

Joshua Piccari jpiccari