Tutorial by Examples: n

{ "some_string": null, "ather_string": "something" } If we will use this way: JSONObject json = new JSONObject(jsonStr); String someString = json.optString("some_string"); We will have output: someString = "null"; So we need to...

Detailed instructions on getting braintree set up or installed.

A <clip-path> defines a shape which acts as a window, only allowing parts of a <path> to show if they are within the <clip-path> shape and cutting off the rest. <vector xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.an...

An AnimatedVectorDrawable requires at least 3 components: A VectorDrawable which will be manipulated An objectAnimator which defines what property to change and how The AnimatedVectorDrawable itself which connects the objectAnimator to the VectorDrawable to create the animation The following...

In AS3, display assets are not visible until they are added to the Display List. The AIR/Flash runtime has a hierarchical display structure (parent child relationship where children can have their own children), with the stage being the top level parent. To add something to the display list, you u...

The s interpolator allows the usage of variables within a string. val name = "Brian" println(s"Hello $name") prints "Hello Brian" to the console when ran.

Swift let frame = CGRect(x: 0, y: 0, width: 100, height: 100) let textField = UITextField(frame: frame) Objective-C CGRect *frame = CGRectMake(0, 0, 100, 100); UITextField *textField = [[UITextField alloc] initWithFrame:frame]; Interface Builder You can also add a UITextField to a storybo...

Add an accessory view above the keyboard. This is commonly used for adding next/previous buttons, or additional buttons like Done/Submit (especially for the number/phone/decimal pad keyboard types which don't have a built-in return key). Swift let textField = UITextField() // initialized however ...

Swift textField.autocapitalizationType = .None Objective-C textField.autocapitalizationType = UITextAutocapitalizationTypeNone; All options: .None \ UITextAutocapitalizationTypeNone : Don't autocapitalize anything .Words \ UITextAutocapitalizationTypeWords : Autocapitalize every word .S...

Given the following CSV file: Id,Name 1,"Joel" 2,"Adam" 3,"Ryan" 4,"Matt" You can read the data with the following script: #r "FSharp.Data.dll" open FSharp.Data type PeopleDB = CsvProvider<"people.csv"> let people = Pe...

BEGIN UPDATE Employees SET PhoneNumber = '5551234567' WHERE Id = 1; UPDATE Employees SET Salary = 650 WHERE Id = 3; END

Create Subtree Add a new remote called plugin pointing to the plugin's repository: git remote add plugin https://path.to/remotes/plugin.git Then Create a subtree specifying the new folder prefix plugins/demo. plugin is the remote name, and master refers to the master branch on the subtree's rep...

String concatenation can be performed using the + operator. For example: String s1 = "a"; String s2 = "b"; String s3 = "c"; String s = s1 + s2 + s3; // abc Normally a compiler implementation will perform the above concatenation using methods involving a StringBui...

0.18.0 Prior to 0.18.0 you can create ranges like this: > range = [1..5] [1,2,3,4,5] : List number > > negative = [-5..3] [-5,-4,-3,-2,-1,0,1,2,3] : List number 0.18.0 In 0.18.0 The [1..5] syntax has been removed. > range = List.range 1 5 [1,2,3,4,5] : List number > &g...

> listOfNumbers = [1,4,99] [1,4,99] : List number > > listOfStrings = ["Hello","World"] ["Hello","World"] : List String > > emptyList = [] -- can be anything, we don't know yet [] : List a > Under the hood, List (linked list) is ...

> ourList = [1,2,3,4,5] [1,2,3,4,5] : List number > > firstElement = List.head ourList Just 1 : Maybe Int > > allButFirst = List.tail ourList Just [2,3,4,5] : Maybe (List Int) This wrapping into Maybe type happens because of the following scenario: What should List.head ret...

List.map : (a -> b) -> List a -> List b is a higher-order function that applies a one-parameter function to each element of a list, returning a new list with the modified values. import String ourList : List String ourList = ["wubba", "lubba", "dub",...

List.filter : (a -> Bool) -> List a -> List a is a higher-order function which takes a one-parameter function from any value to a boolean, and applies that function to every element of a given list, keeping only those elements for which the function returns True on. The function that List.f...

def multiply(factor: Int)(numberToBeMultiplied: Int): Int = factor * numberToBeMultiplied val multiplyBy3 = multiply(3)_ // resulting function signature Int => Int val multiplyBy10 = multiply(10)_ // resulting function signature Int => Int val sixFromCurriedCall = multiplyBy3(2) //6...

def numberOrCharacterSwitch(toggleNumber: Boolean)(number: Int)(character: Char): String = if (toggleNumber) number.toString else character.toString // need to explicitly specify the type of the parameter to be curried // resulting function signature Boolean => String val switchBetween3A...