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zoubin / permutation.js

Created June 7, 2017 06:59

How to exhaust all permutations of an array of elements

	function * permutation (input) {
	let n = input.length
	if (n === 0) {
	yield []
	} else {
	let needle = input.pop()
	for (let p of permutation(input)) {
	for (let i = 0; i < n; i++) {
	let q = p.slice()
	q.splice(i, 0, needle)

zoubin / hackModuleInHtmlForVirtualMachines.js

Created August 7, 2016 16:58

Fix `require` in script tags of pages for electron renderer process

	/**
	* convert `Shared Folders\projects\electron-quick-start`
	* to `Z:\projects\electron-quick-start`
	* See https://github.com/electron/electron/issues/6760
	*
	* Copy the source code to your page
	* or add a script tag with src refering to this module
	* BEFORE any module `require` takes place.
	*
	* Now you can `require` modules in HTML script tags as you do in node.

zoubin / isValidateDate.js

Created June 29, 2016 10:40

Check if a given date string specifies a valid date

	// http://jsbin.com/lamakud/edit?html,output
	function isValidateDate(datestr) {
	var ms = Date.parse(datestr)
	if (isNaN(ms)) return false
	return ~~(datestr.split(/[^d]/).pop()) === new Date(ms).getDate()
	}
	module.exports = isValidateDate

zoubin / isLeap.js

Created June 29, 2016 10:27

Check if the given year is a leap year