kieranbarker

/**
 * Get today's date.
 * https://gist.github.com/kieranbarker/2c300d73059697a4417e12bd40cdef75
 * @returns {Date} A Date object representing today's date at midnight in UTC.
 */
function getTodaysDate() {
  const dateString = new Date().toISOString().slice(0, 10);
  return new Date(dateString);
}

kieranbarker

import * as fs from 'fs';
import * as fsPromises from 'fs/promises';

const file = 'hello_world.txt';
const data = 'Hello, World!';

//
// Callback API
//

kieranbarker

{
  "name": "read_write",
  "version": "1.0.0",
  "description": "Asynchronously read and write files.",
  "private": true,
  "main": "read_write.js",
  "type": "module",
  "scripts": {
    "start": "node read_write.js",
    "test": "echo \"Error: no test specified\" && exit 1"

kieranbarker

[
  "alabama",
  "alaska",
  "arizona",
  "arkansas",
  "california",
  "colorado",
  "connecticut",
  "delaware",
  "florida",

kieranbarker

# Alias for simple Python server
serve() {
  python3 -m http.server $1
}

kieranbarker

/**
 * Return the item at the given index in the array, allowing for positive and
 * negative integers. Negative integers count back from the last item
 * in the array.
 * 
 * {@link https://gist.github.com/kieranbarker/1bb4ae463f3cd8138b4805983de49f4d}
 * 
 * @param {Array} array The array
 * @param {Number} index The index
 * @returns {*} The item at the given index

kieranbarker

/**
 * Format a JSON string for readability
 * @param {String} text The JSON string
 * @param {Number|String} space The number of spaces, or a string, to indent by
 * @returns {String} The newly formatted JSON string
 * @license MIT
 */
function formatJSON (text, space = 2) {
  return JSON.stringify(JSON.parse(text), null, space);
}

kieranbarker

/**
 * Get a random truthy/falsy value
 * {@link https://gist.github.com/kieranbarker/25b1b4b4cef14c65b10dcefdc462f6ee}
 * @returns {Number} 1 (truthy) or 0 (falsy)
 */
function fiftyFifty () {
  return Math.round(Math.random());
}

kieranbarker

/**
 * Get the common ancestor of two or more elements
 * {@link https://gist.github.com/kieranbarker/cd86310d0782b7c52ce90cd7f45bb3eb}
 * @param {String} selector A valid CSS selector
 * @returns {Element} The common ancestor
 */
function getCommonAncestor (selector) {
  // Get the elements matching the selector
  const elems = document.querySelectorAll(selector);

kieranbarker

/**
 * Check if a string is a valid email address
 * {@link https://gist.github.com/kieranbarker/55a12cac034c386a5b3669b991290bf6}
 * @param {String} str The string
 * @returns {Boolean} Whether the string is a valid email address
 */
function isValidEmail (str) {
  // The regular expression used by [type="email"]
  // https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address
  const regex = /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;