Tutorial by Examples: ci

You can enhance your own classes with generics just like NSArray or NSDictionary. @interface MyClass<__covariant T> @property (nonnull, nonatomic, strong, readonly) NSArray<T>* allObjects; - (void) addObject:(nonnull T)obj; @end

// circle objects: { x:, y:, radius: } // return true if the 2 circles are colliding // c1 and c2 are circles as defined above function CirclesColliding(c1,c2){ var dx=c2.x-c1.x; var dy=c2.y-c1.y; var rSum=c1.radius+c2.radius; return(dx*dx+dy*dy<=rSum*rSum); }

// rectangle object: { x:, y:, width:, height: } // circle object: { x:, y:, radius: } // return true if the rectangle and circle are colliding function RectCircleColliding(rect,circle){ var dx=Math.abs(circle.x-(rect.x+rect.width/2)); var dy=Math.abs(circle.y-(rect.y+rect.height/2));...

// [x0,y0] to [x1,y1] define a line segment // [cx,cy] is circle centerpoint, cr is circle radius function isCircleSegmentColliding(x0,y0,x1,y1,cx,cy,cr){ // calc delta distance: source point to line start var dx=cx-x0; var dy=cy-y0; // calc delta distance: line start to e...

Tests if an [x,y] point is inside a circle. // circle objects: {cx:,cy:,radius:,startAngle:,endAngle:} // var circle={ // cx:150, cy:150, // centerpoint // radius:100, // } // Return true if the x,y point is inside the circle function isPointInCircle(x,y,circle){ var dx=x-circ...

This example shows how to perform basic mathematical operations using BigDecimals. 1.Addition BigDecimal a = new BigDecimal("5"); BigDecimal b = new BigDecimal("7"); //Equivalent to result = a + b BigDecimal result = a.add(b); System.out.println(result); Result : 12 ...

Dependencies can be added for specific configuration like test/androidTest androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.1' testCompile 'junit:junit:3.8.1' Alternatively create your own configuration configurations { myconfig } And then download dependency fo...

GHCi supports imperative-style breakpoints out of the box with interpreted code (code that's been :loaded). With the following program: -- mySum.hs doSum n = do putStrLn ("Counting to " ++ (show n)) let v = sum [1..n] putStrLn ("sum to " ++ (show n) ++ " = "...

If you want to extract a subset of an array (i.e. numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9]) you can easily do this with one of the following examples: numbers[0..2] will return [1, 2, 3] numbers[3...-2] will return [3, 4, 5, 6] numbers[-2..] will return [8, 9] numbers[..] will return [1, 2, 3, 4,...

private List<FooBar> _fooBars; public List<FooBar> FooBars { get { return _fooBars ?? (_fooBars = new List<FooBar>()); } } The first time the property .FooBars is accessed the _fooBars variable will evaluate as null, thus falling through to the assignment statement ass...

The REPLACE statement can work with regular expressions directly: DATA(lv_test) = 'The quick brown fox'. REPLACE ALL OCCURRENCES OF REGEX '\wo' IN lv_test WITH 'XX'. The variable lv_test will evaluate to The quick bXXwn XXx.

This is a .NET regex specific modifier expressed with n. When used, unnamed groups (like (\d+)) are not captured. Only valid captures are explicitly named groups (e.g. (?<name> subexpression)). (?n)(\d+)-(\w+)-(?<id>\w+) will match the whole 123-1_abc-00098, but (\d+) and (\w+) won't...

Partial classes provide a clean way to separate core logic of your scripts from platform specific methods. Partial classes and methods are marked with the keyword partial. This signals the compiler to leave the class "open" and look in other files for the rest of the implementation. // E...

There are a few common symbols in use: copyright sign ©, and trademark signs ® ™ fractions like ¼ superscripts. For instance, a shorthand for square meters is m².

In this example we create a new list element with the text "new text", and select the first unordered list, and its first list element. let newElement = document.createElement("li"); newElement.innerHTML = "new text"; let parentElement = document.querySelector(&quo...

When we want to handle array of data, its better to use async.each. When we want to perform something with all data & want to get the final callback once everything is done, then this method will be useful. This is handled in parallel way. function createUser(userName, callback) { //creat...

Often you want to match an expression only in specific places (leaving them untouched in others, that is). Consider the following sentence: An apple a day keeps the doctor away (I eat an apple everyday). Here the "apple" occurs twice which can be solved with so called backtracking cont...

C11 The function specifier _Noreturn was introduced in C11. The header <stdnoreturn.h> provides a macro noreturn which expands to _Noreturn. So using _Noreturn or noreturn from <stdnoreturn.h> is fine and equivalent. A function that's declared with _Noreturn (or noreturn) is not allowe...

An implicit style applies to all elements of a given type within scope. An implicit style can omit x:Key since it is implicitly the same as the style's TargetType property. <StackPanel> <StackPanel.Resources> <Style TargetType="TextBlock"> <...

Phantom types are useful for dealing with data, that has identical representations but isn't logically of the same type. A good example is dealing with currencies. If you work with currencies you absolutely never want to e.g. add two amounts of different currencies. What would the result currency o...