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Generator functions (defined by the function* keyword) run as coroutines, generating a series of values as they're requested through an iterator. function* name(parameters) { yield value; return value } generator = name(arguments) { value, done } = generator.next(value) { value, done } = ge...

Generators are lazy iterators created by generator functions (using yield) or generator expressions (using (an_expression for x in an_iterator)). yield <expr> yield from <expr> <var> = yield <expr> next(<iter>)

Python does common mathematical operators on its own, including integer and float division, multiplication, exponentiation, addition, and subtraction. The math module (included in all standard Python versions) offers expanded functionality like trigonometric functions, root operations, logarithms, a...

window.history.pushState(domain, title, path); window.history.replaceState(domain, title, path); ParameterDetailsdomainThe domain you want to update totitleThe title to update topathThe path to update to The HTML5 History API is not implemented by all browsers and implementations tend to ...

trap action sigspec... # Run "action" on a list of signals trap sigspec... # Omitting action resets traps for signals ParameterMeaning-pList currently installed traps-lList signal names and corresponding numbers The trap utility is a special shell built-in. It's defined in POSI...

require spl_autoload_require Autoloading, as part of a framework strategy, eases the amount of boilerplate code you have to write.

A jQuery selectors selects or finds a DOM (document object model) element in an HTML document. It is used to select HTML elements based on id, name, types, attributes, class and etc. It is based on existing CSS selectors. Tag: No marker, use the tag directly Id: #id Class: .className Attrib...

.prototype.createdCallback() .prototype.attachedCallback() .prototype.detachedCallback() .prototype.attributeChangedCallback(name, oldValue, newValue) document.registerElement(name, [options]) ParameterDetailsnameThe name of the new custom element.options.extendsThe name of the native el...

localStorage.setItem(name, value); localStorage.getItem(name); localStorage.name = value; localStorage.name; localStorage.clear() localStorage.removeItem(name); ParameterDescriptionnameThe key/name of the itemvalueThe value of the item The Web Storage API is sp...

A vector is a dynamic array with automatically handled storage. The elements in a vector can be accessed just as efficiently as those in an array with the advantage being that vectors can dynamically change in size. In terms of storage the vector data is (usually) placed in dynamically allocated me...

A selector is a chain of simple selectors, separated by combinators. Selectors are case insensitive (including against elements, attributes, and attribute values). The universal selector (*) is implicit when no element selector is supplied (i.e. *.header and .header is equivalent). PatternMatche...

UIButton : UIControl intercepts touch events and sends an action message to a target object when it's tapped. You can set the title, image, and other appearance properties of a button. In addition, you can specify a different appearance for each button state. Button Types A button’s type defi...

In C++, it is possible to define operators such as + and -> for user-defined types. For example, the <string> header defines a + operator to concatenate strings. This is done by defining an operator function using the operator keyword. The operators for built-in types cannot be change...

ColumnColumnCellCell First, establish if the device is capable of accepting Touch ID input. if (context.CanEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, out AuthError)) If it does then we can display the Touch ID UI by using: context.EvaluatePolicy(LAPolicy.DeviceOwnerAuth...

CSS selectors identify specific HTML elements as targets for CSS styles. This topic covers how CSS selectors target HTML elements. Selectors use a wide range of over 50 selection methods offered by the CSS language, including elements, classes, IDs, pseudo-elements and pseudo-classes, and patterns. ...

Pipe operators, available in magrittr, dplyr, and other R packages, process a data-object using a sequence of operations by passing the result of one step as input for the next step using infix-operators rather than the more typical R method of nested function calls. Note that the intended aim of p...