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Shaikhul Islam shaikhul

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@shaikhul
shaikhul / banner.html
Created October 15, 2015 01:13
JavaScript to show random words in DOM
<!--
This small snippet will update a DOM in regular interval,
the tricky part is using the setTimeout, can you solve it any other way ?
-->
<html>
<body>
<p>I like <span id="banner">...</span></p>
<script>
var msgs = ['JavaScript', 'Python', 'PHP'];
var span = document.getElementById("banner");
@shaikhul
shaikhul / lambda_function.php
Last active October 2, 2016 02:49
lamda_function.md
<?php
// create a lamda function by assigning an anonymous function to a variable
$greet = function ($name) {
return "Hello {$name}";
};
// it will print Hello World
echo $greet("World") . PHP_EOL;
@shaikhul
shaikhul / annonymous_function_as_argument.php
Created October 2, 2016 02:30
annonymous_function_as_argument.php
<?php
// define a function that accepts a callable
function decorate(callable $func) {
return "<p>" . $func() . "</p>";
}
// execute decorate by passing an anonymous function
$result = decorate(function () {
return "Hello World!";
@shaikhul
shaikhul / anonymous_function_currying.php
Created October 2, 2016 02:32
anonymous_function_currying.php
<?php
// define a curry function
$make_adder = function ($num1) {
return function ($num2) use ($num1) {
return $num1 + $num2;
};
};
$five_adder = $make_adder(5);
@shaikhul
shaikhul / AuthorizerInterface.php
Last active January 17, 2017 20:58
AuthorizerInterface
<?php
interface AuthorizerInterface {
public function authorize($username, $password);
}
@shaikhul
shaikhul / DummyAuthorizer.php
Last active January 16, 2017 21:35
<?php
require_once "AuthorizerInterface.php";
/**
* Example of Test doubles, informally its being called as Mock (but not a real mock)
*/
class DummyAuthorizer implements AuthorizerInterface {
public function authorize($username, $password) {
return null;
@shaikhul
shaikhul / Authorizer.php
Created January 16, 2017 21:34
<?php
require_once "AuthorizerInterface.php";
/**
* Example of Test doubles, informally its being called as Mock (but not a real mock)
*/
class Authorizer implements AuthorizerInterface {
public function authorize($username, $password) {
// it implements actual authorization logic
@shaikhul
shaikhul / System.php
Created January 16, 2017 21:37
<?php
require_once "AuthorizerInterface.php";
class System {
public function __construct(AuthorizerInterface $authorizer) {
$this->authorizer = $authorizer;
}
public function loginCount() {
@shaikhul
shaikhul / test_system.php
Created January 16, 2017 21:42
<?php
require_once "DummyAuthorizer.php";
require_once "System.php";
function test_system_has_no_loggedin_users() {
/*
* In this test I want to test loginCount() method and we don't need to provide any real authorizer to create the system object
* So we are passing a DummyAuthorizer whose authorize method would never be called from this test
*/
@shaikhul
shaikhul / AcceptingAuthorizerStub.php
Created January 21, 2017 02:56
<?php
/**
* Stub example: We will use this stub whenenver we need to test a system that requires a logged in user
*/
class AcceptingAuthorizerStub implements Authorizer {
public function authorize($username, $password) {
// always return true
return $true;
}