A defer statement in Go is simply a function call marked to be executed at a later time. Defer statement is an ordinary function call prefixed by the keyword defer.
defer someFunction()
A deferred function is executed once the function that contains the defer statement returns. Actual call to th...
[1, 2, [[3, 4], [5]], 6].flatten # => [1, 2, 3, 4, 5, 6]
If you have a multi-dimensional array and you need to make it a simple (i.e. one-dimensional) array, you can use the #flatten method.
Standard enumerations allow users to declare a useful name for a set of integers. The names are collectively referred to as enumerators. An enumeration and its associated enumerators are defined as follows:
enum myEnum
{
enumName1,
enumName2,
};
An enumeration is a type, one which is...
If targeting Flash Player 11+, the built-in removeChildren method is the best way to remove all children:
removeChildren(); //a start and end index can be passed
For legacy applications, the same can be accomplished with a loop:
while (numChildren > 0) {
removeChildAt(0);
}
Enums in Swift are much more powerful than some of their counterparts in other languages, such as C. They share many features with classes and structs, such as defining initialisers, computed properties, instance methods, protocol conformances and extensions.
protocol ChangesDirection {
mutati...
package {
import flash.events.TimerEvent;
import flash.utils.Timer;
public class CountdownTimer extends Timer {
public var time:Number = 0;
public function CountdownTimer(time:Number = Number.NEGATIVE_INFINITY, delay:Number = 1000) {
super(delay, repeatCount);
...
3.0
Swift 3 introduces the CountedSet class (it's the Swift version of the NSCountedSet Objective-C class).
CountedSet, as suggested by the name, keeps track of how many times a value is present.
let countedSet = CountedSet()
countedSet.add(1)
countedSet.add(1)
countedSet.add(1)
countedSet.a...
Select the .xcdatamodeld file. You will notice you have no
entities. You will have to create one yourself. At the bottom of
Xcode you will notice a button that says "Add Entity" click it and
you will have a new entity for you to work with on the project.
In this step there are ...
Pattern matching allows to deconstruct complex values and it is by no way limited to the “outer most” level of the representation of a value. To illustrate this, we implement the function transforming a boolean expression into a boolean expression where all negations are only on atoms, the so calle...
Pattern matching can be used to deconstruct records. We illustrate this with a record type representing locations in a text file, e.g. the source code of a program.
type location = {
filename : string;
line: int;
column: int;
offset: int;
}
A value x of type location can be deconstr...
We prepare a file called reverser.ml with the following contents:
let acc = ref [] in
try
while true do
acc := read_line () :: !acc;
done
with
End_of_file -> print_string (String.concat "\n" !acc)
We then compile our program using ...
The List.fold_left and List.fold_right functions are higher-order functions that implement the outer logic of list aggregation. Aggregating a list, sometimes also referred to as reducing a list, means computing a value derived from the sequential inspection of all items in that list.
The documenta...
There are several additional attributes that the Volley NetworkImageView adds to the standard ImageView. However, these attributes can only be set in code. The following is an example of how to make an extension class that will pick up the attributes from your XML layout file and apply them to the N...
In Elm, reducing functions are called "folds", and there are two standard methods to "fold" values up: from the left, foldl, and from the right, foldr.
> List.foldl (+) 0 [1,2,3]
6 : number
The arguments to foldl and foldr are:
reducing function: newValue -> accumul...
A do while loop is the same as a while loop, except that it is guaranteed to execute at least one time.
The following loop will execute 100 times.
int i = 0;
do {
i++;
} while (i < 100);
A similar loop, but with a different condition, will execute 1 time.
int i = 0;
do {
i++;
...
localStorage, sessionStorage are JavaScript Objects and you can treat them as such.
Instead of using Storage Methods like .getItem(), .setItem(), etc… here's a simpler alternative:
// Set
localStorage.greet = "Hi!"; // Same as: window.localStorage.setItem("greet", "Hi!&qu...
Unfortunately ActionScript 3 does not have a concept of generics, so it follows that there is no way to define a typed array as Array<T>. There is however a special class Vector.<T> which works in a similar way except you must provide a reference to a concrete class when instantiating th...
Before ECMAScript 2015 (ES6), a parameter's default value could be assigned in the following way:
function printMsg(msg) {
msg = typeof msg !== 'undefined' ? // if a value was provided
msg : // then, use that value in the reassignemnt
'Default value for ...
Sometimes we need to change type from Collection<T?> to Collections<T>. In that case, filterNotNull is our solution.
val a: List<Int?> = listOf(1, 2, 3, null)
val b: List<Int> = a.filterNotNull()
