Roy Ling royling

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Keep practicing and learning everyday!

royling / gitr

Last active March 6, 2025 03:16

run git command in multiple repositories

	#! /bin/bash
	CWD=`pwd`

	printUsage() {
	echo "gitr - Git for multiple repositories made easy!"
	echo -e "Usage: gitr <branch\|status\|push\|pull\|fetch\|merge\|stash\|checkout [options] [arguments]> [--repos <repo>...] [--gitr-base <path>]"
	}

	println() {
	echo "$1"

royling / interweave.js

Last active February 25, 2018 13:49

Interweave arrays

	// inspired when reading https://leanpub.com/understandinges6/read#leanpub-auto-define-tags
	// this is the behavior that template tags may interweave literals and subsitutions arrays
	var interweave = (a, b) => {
	let min = Math.min(a.length, b.length);
	return Array.apply(null, Array(min)).reduce((result, value, index) => {
	result.push(a[index], b[index]);
	return result;
	}, []).concat((a.length > min ? a : b).slice(min));
	};

royling / spec.js

Last active August 29, 2015 14:08

#explain-js-type-coercion-in-js: convert to boolean

	describe("toBoolean", function() {

	var toBool = toBoolean;

	it("should return true for all objects", function() {
	expect(toBool({})).toBe(true);
	expect(toBool([])).toBe(true);
	});

	it("should return false for falsy values", function() {

royling / isPrimitiveSpec.js

Last active August 29, 2015 14:08

#explain-js-type-coercion-in-js: EcmaScript Internal [[ToPrimitive]]

	describe("isPrimitive", function() {

	it("should return true for primitive values", function() {
	expect(isPrimitive(0)).toBe(true);
	expect(isPrimitive('')).toBe(true);
	expect(isPrimitive(false)).toBe(true);
	expect(isPrimitive(null)).toBe(true);
	expect(isPrimitive(undefined)).toBe(true);
	expect(isPrimitive(NaN)).toBe(true);
	});

royling / iterate.js

Last active August 29, 2015 14:07

iterate iterator (created from generator function) in for-of/while/for loops

	function* generatorFunction() {
	// ...
	}
	let iterator = generatorFunction();

	// for-of loop
	for (let k of iterator) {
	// ...
	}

royling / connect.js

Last active August 29, 2015 14:06

use mongoose with co

	var mongoose = require('mongoose');
	var db;

	var connect = module.exports = function () {
	mongoose.connect('mongodb://localhost/events');
	db = mongoose.connection;
	db.on('error', function(err) {
	console.error('Error', err);
	});
	db.once('open', function() {

royling / format.js

Last active August 29, 2015 14:04

format number to add thousand separator (e.g. `,`) in js -- inspired by http://www.mredkj.com/javascript/nfbasic.html

	function format(num, fmt) {
	if (isNaN(Number(num))) {
	throw new TypeError('Not a number');
	}
	if (typeof fmt.scale == 'number') {
	num = Number(num).toFixed(fmt.scale);
	}
	num = String(num).replace('.', fmt.outDecSep\|\|'.');
	var regexp = /(\d+)(\d{3})/;
	while(regexp.test(num)) {

royling / load_template.js

Last active October 26, 2015 15:06

Use <link> to define templates and load them ondomready

	$(function() {
	var tplts = Object.create(null), importLinks = $('link[rel="import"]');
	// load all imported templates
	importLinks.each(function(idx, elem) {
	$.get(elem.href, function(data) {
	var view = elem.getAttribute('href');
	tplts[view] = data;
	if (Object.keys(tplts).length == importLinks.length) {
	// all are loaded
	console.info("all templates are loaded:", tplts);

royling / check_guess.coffee

Last active August 29, 2015 13:57

sudoku: check if a guess is valid or not

	validGuess = (sudoku, x, y, value) ->
	row = sudoku[y]
	column = row[x] for row in sudoku
	cube = (sudoku[~~(y/3) + i][~~(x/3) + j] for i in [0..2] for j in [0..2]).reduce (result, curr) -> result.concat(curr)
	value not in [].concat row, column, cube

	guess = (sudoku, x, y, value) ->
	sudoku[y][x] = value if validGuess sudoku, x, y, value

	# sudoku = genValidSudoku()

royling / index.html

Created May 27, 2013 13:35

An example of using seajs with jquery & jquery plugin (dataTables)