Tutorial by Examples: if

// List folder Dropbox.authorizedClient!.files.listFolder(path: "/nonexistantpath").response { response, error in print("*** List folder ***") if let result = response { print("Folder contents:") for entry in result.entries { pr...

Dropbox.authorizedClient!.files.getMetadata(path: "/test.jpg", includeMediaInfo: true).response { response, error in if let result = response as? Files.FileMetadata { print(result.name) if result.mediaInfo != nil { switch result.mediaInfo! as Files.Med...

curl -X POST https://api.dropboxapi.com/2/sharing/list_shared_links \ --header "Authorization: Bearer <ACCESS_TOKEN>" \ --header "Content-Type: application/json" \ --data "{\"path\": \"/test.txt\", \"direct_only\": true}&quo...

Dropbox.authorizedClient!.sharing.createSharedLink(path: "/test.txt").response({ response, error in if let link = response { print(link.url) } else { print(error!) } })

if [[ $1 -eq 1 ]]; then echo "1 was passed in the first parameter" elif [[ $1 -gt 2 ]]; then echo "2 was not passed in the first parameter" else echo "The first parameter was not 1 and is not more than 2." fi The closing fi is necessary, but the eli...

In the same module Inside a module named "MyModule", Xcode generates a header named MyModule-Swift.h which exposes public Swift classes to Objective-C. Import this header in order to use the Swift classes: // MySwiftClass.swift in MyApp import Foundation // The class must be `public`...

If MyFramework contains Objective-C classes in its public headers (and the umbrella header), then import MyFramework is all that's necessary to use them from Swift. Bridging headers A bridging header makes additional Objective-C and C declarations visible to Swift code. When adding project files, ...

The -import-objc-header flag specifies a header for swiftc to import: // defs.h struct Color { int red, green, blue; }; #define MAX_VALUE 255 // demo.swift extension Color: CustomStringConvertible { // extension on a C struct public var description: String { return &q...

To conditionally include a block of code, the preprocessor has several directives (e.g #if, #ifdef, #else, #endif, etc). /* Defines a conditional `printf` macro, which only prints if `DEBUG` * has been defined */ #ifdef DEBUG #define DLOG(x) (printf(x)) #else #define DLOG(x) #endif Norm...

INSERT INTO Customers (FName, LName, Email, PreferredContact) VALUES ('Zack', 'Smith', '[email protected]', 'EMAIL'); This statement will insert a new row into the Customers table. Data will only be inserted into the columns specified - note that no value was provided for the PhoneNumber column. ...

An if statement checks whether a Bool condition is true: let num = 10 if num == 10 { // Code inside this block only executes if the condition was true. print("num is 10") } let condition = num == 10 // condition's type is Bool if condition { print("num is 10&...

var favoriteColors: Set = ["Red", "Blue", "Green"] //favoriteColors = {"Blue", "Green", "Red"} You can use the insert(_:) method to add a new item into a set. favoriteColors.insert("Orange") //favoriteColors = {"Red&q...

(Note: All examples using let are also valid for const) var is available in all versions of JavaScript, while let and const are part of ECMAScript 6 and only available in some newer browsers. var is scoped to the containing function or the global space, depending when it is declared: var x = 4; /...

Normally a change of webpage within an Iframe is initiated from with the Iframe, for example, clicking a link inside the Ifame. However, it is possible to change an IFrame's content from outside the IFrame. You can use an anchor tag whose href attribute is set to the desired URL and whose target at...

The value of a cookie can be modified by resetting the cookie setcookie("user", "John", time() + 86400, "/"); // assuming there is a "user" cookie already Cookies are part of the HTTP header, so setcookie() must be called before any output is sent to the...

Use the isset() function upon the superglobal $_COOKIE variable to check if a cookie is set. Example: // PHP <7.0 if (isset($_COOKIE['user'])) { // true, cookie is set echo 'User is ' . $_COOKIE['user']; else { // false, cookie is not set echo 'User is not logged in'; } ...

There are three keywords that act as access specifiers. These limit the access to class members following the specifier, until another specifier changes the access level again: KeywordDescriptionpublicEveryone has accessprotectedOnly the class itself, derived classes and friends have accessprivate...

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...

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...

The operators << and >> are commonly used as "write" and "read" operators: std::ostream overloads << to write variables to the underlying stream (example: std::cout) std::istream overloads >> to read from the underlying stream to a variable (example: s...