ChukwuEmekaAjah
/ init.js
Created
October 31, 2018 12:03
Initialization and use of vhost expressjs middleware library.
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| const express = require('express'); | |
| const app = express(); | |
| const vhost = require('vhost'); | |
| // after registering all middleware, then you register your hostname as | |
| app.use(vhost('admin.localhost',app)); |
ChukwuEmekaAjah
/ global_variables.js
Created
October 31, 2018 12:08
Global variables in vhost index.js file.
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| var asteriskRegExp = /\*/g | |
| var asteriskReplace = '([^\.]+)' | |
| var endAnchoredRegExp = /(?:^|[^\\])(?:\\\\)*\$$/ | |
| var escapeRegExp = /([.+?^=!:${}()|\[\]\/\\])/g | |
| var escapeReplace = '\\$1' |
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| function isregexp(val) { | |
| return Object.prototype.toString.call(val) === '[object RegExp]' | |
| } |
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| function vhostof(req, regexp) { | |
| var host = req.headers.host | |
| var hostname = hostnameof(req) | |
| if (!hostname) { | |
| return | |
| } | |
| var match = regexp.exec(hostname) |
ChukwuEmekaAjah
/ hostnameof.js
Created
October 31, 2018 13:14
Extracting the hostname from a host string in a NodeJS request header.
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| function hostnameof(req) { | |
| var host = req.headers.host | |
| if (!host) { | |
| return | |
| } | |
| var offset = host[0] === '[' | |
| ? host.indexOf(']') + 1 | |
| : 0 |
ChukwuEmekaAjah
/ hostregexp.js
Created
October 31, 2018 14:12
Creating a dynamic code regular expression object to match hosts.
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| function hostregexp(val) { | |
| var source = !isregexp(val) | |
| ? String(val).replace(escapeRegExp, escapeReplace).replace(asteriskRegExp, asteriskReplace) | |
| : val.source | |
| // force leading anchor matching | |
| if (source[0] !== '^') { | |
| source = '^' + source | |
| } |
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| /** | |
| * Create a vhost middleware. | |
| * | |
| * @param {string|RegExp} hostname | |
| * @param {function} handle | |
| * @return {Function} | |
| * @public | |
| */ | |
| function vhost(hostname, handle) { |
ChukwuEmekaAjah
/ commonRegexpPatterns.js
Last active
July 29, 2020 21:08
A list of common regular expression patterns implemented in every day programming work.
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| let dayRegex = /^(([0-2]?[1-9])|([3][0-1]))$/; //01-31 | |
| let monthRegex = /^(([0]?[1-9])|([1][0-2]))$/; //01-12 | |
| let emailRegex = /^\S*?@\S*?\.[a-z]{2,3}^/; | |
| let lessThanTen = /^[0]?[1-9]?$/ // 1-9, 01-09 | |
| let percentRegex = /^([1-9][0-9]?)$|(^100$)/ // 1-100 |
ChukwuEmekaAjah
/ calendar.js
Created
August 9, 2020 00:42
A utility function that prints out an ordered calendar based on the passed in date or present day date. It was inspired by the Facebook page publishing tools date picker functionality.
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| function isLeapYear(year){ | |
| return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0); | |
| } | |
| function calendar(inputDate){ | |
| const presentDate = inputDate ? (new Date(inputDate)) : (new Date()); | |
| console.log("date is ", presentDate) | |
| if(Boolean(presentDate) === false){ |
ChukwuEmekaAjah
/ linearDataDuplicateChecker.js
Created
August 23, 2020 23:07
Linear time data duplicate check temporary storage comparison between JavaScript arrays and objects. It appears using arrays as temporary storage would give you 2x faster performance when compared to using Object literals.
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| let numbers = []; | |
| for(let i = 0; i < 100000; i++){ | |
| numbers.push(Math.round(Math.random()*100000)) | |
| } | |
| function hashDuplicate(value){ | |
| console.time("hash duplicate") | |
| let hashValues = {} | |
| for(let i = 0; i < numbers.length; i++){ |
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