Tutorial by Examples: p

This page describes how to use the Meteor command-line tool (for example, when downloading packages, deploying your app, etc) behind a proxy server. Like a lot of other command-line software, the Meteor tool reads the proxy configuration from the HTTP_PROXY and HTTPS_PROXY environment variables (th...

You can use the nil coalescing operator to unwrap a value if it is non-nil, otherwise provide a different value: func fallbackIfNil(str: String?) -> String { return str ?? "Fallback String" } print(fallbackIfNil("Hi")) // Prints "Hi" print(fallbackIfNil(nil)...

If you don't want to add Unix commands to your PATH on Windows, you can download a standalone SSH client like PuTTY. Download PuTTY here, then follow the instructions below to get a build machine. Call meteor admin get-machine <os-architecture> --json Copy and save the private key from the...

The Autocomplete widgets provides suggestions while you type into the field. <script> $(document).ready(function() { var tags = ["ask","always", "all", "alright", "one", "foo", "blackberry", "tweet","...

Dialog is a window which is overlay positioned within the viewport. <script> $(function() { $( "#dialog" ).dialog(); }); </script> <div id="dialog" title="Basic dialog"> <p>This is the default dialog which is useful for displayin...

Enable draggable functionality on any DOM element. <script> $(function() { $( "#draggable" ).draggable(); }); </script> <div id="draggable" class="ui-widget-content"> <p>Drag me around</p> </div>

A common pitfall is confusing the equality comparison operators is and ==. a == b compares the value of a and b. a is b will compare the identities of a and b. To illustrate: a = 'Python is fun!' b = 'Python is fun!' a == b # returns True a is b # returns False a = [1, 2, 3, 4, 5] b = a ...

To offset text either upward or downward you can use the tags <sup> and <sub>. To create superscript: <sup>superscript here</sup> To create subscript: <sub>subscript here</sub>

If you are using the PASSWORD_DEFAULT method to let the system choose the best algorithm to hash your passwords with, as the default increases in strength you may wish to rehash old passwords as users log in <?php // first determine if a supplied password is valid if (password_verify($plaintex...

Create password hashes using password_hash() to use the current industry best-practice standard hash or key derivation. At time of writing, the standard is bcrypt, which means, that PASSWORD_DEFAULT contains the same value as PASSWORD_BCRYPT. $options = [ 'cost' => 12, ]; $hashedPasswor...

password_verify() is the built-in function provided (as of PHP 5.5) to verify the validity of a password against a known hash. <?php if (password_verify($plaintextPassword, $hashedPassword)) { echo 'Valid Password'; } else { echo 'Invalid Password.'; } ?> All supported hashi...

Spoilers are used to hide text or images that would otherwise negatively impact another user's experience. They can be created using >! >!This is hidden until your cursor hovers on top of it This is hidden until your cursor hovers on top of it Note: This is not part of standard markup...

Unlike classes, which are passed by reference, structures are passed through copying: first = "Hello" second = first first += " World!" // first == "Hello World!" // second == "Hello" String is a structure, therefore it's copied on assignment. Structu...

Add the following target in your build.xml <!-- Bootstrap ivy --> <target name="ivy.bootstrap" description="Download Apache Ivy"> <!-- Define the version to use --> <property name="ivy.version">2.4.0</property> <!-- ...

Properties can be added to a class or struct (technically enums too, see "Computed Properties" example). These add values that associate with instances of classes/structs: class Dog { var name = "" } In the above case, instances of Dog have a property named name of type...

Lazy stored properties have values that are not calculated until first accessed. This is useful for memory saving when the variable's calculation is computationally expensive. You declare a lazy property with lazy: lazy var veryExpensiveVariable = expensiveMethod() Often it is assigned to a retu...

Different from stored properties, computed properties are built with a getter and a setter, performing necessary code when accessed and set. Computed properties must define a type: var pi = 3.14 class Circle { var radius = 0.0 var circumference: Double { get { ret...

Type properties are properties on the type itself, not on the instance. They can be both stored or computed properties. You declare a type property with static: struct Dog { static var noise = "Bark!" } print(Dog.noise) // Prints "Bark!" In a class, you can use the c...

The following is handy to have in build logs that identifies the build machine, and some parameters; simply make you main task depend on this task to print it before every build. <!-- Print Environment Info --> <target name="environment"> <!-- Get the current ti...

Mathematical operations on values other than numbers return NaN. "a" + 1 "b" * 3 "cde" - "e" [1, 2, 3] * 2 An exception: Single-number arrays. [2] * [3] // Returns 6 Also, remember that the + operator concatenates strings. "a" + "b&...