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try { … } catch (error) { … } try { … } finally { … } try { … } catch (error) { … } finally { … } throw new Error([message]); throw Error([message]); try allows you to define a block of code to be tested for errors while it is being executed. catch allows you to define a block of code ...

navigator.geolocation.getCurrentPosition(successFunc, failureFunc) navigator.geolocation.watchPosition(updateFunc, failureFunc) navigator.geolocation.clearWatch(watchId) The Geolocation API does what you might expect: retrieve information about the client's whereabouts, represented in lat...

The HTML <table> element allows web authors to display tabular data (such as text, images, links, other tables, etc.) in a two dimensional table with rows and columns of cells. <table></table> <thead></thead> <tbody></tbody> <tfoot></tfoot&...

timeoutID = setTimeout(function() {}, milliseconds) intervalID = setInterval(function() {}, milliseconds) timeoutID = setTimeout(function() {}, milliseconds, parameter, parameter, ...) intervalID = setInterval(function() {}, milliseconds, parameter, parameter, ...) clearTimeout(timeoutID) cle...

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...

For more information about errors, see The Swift Programming Language.

Array is an ordered, random-access collection type. Arrays are one of the most commonly used data types in an app. We use the Array type to hold elements of a single type, the array's Element type. An array can store any kind of elements---from integers to strings to classes. Array<Element...

Metaclasses allow you to deeply modify the behaviour of Python classes (in terms of how they're defined, instantiated, accessed, and more) by replacing the type metaclass that new classes use by default. When designing your architecture, consider that many things which can be accomplished with...

A Hash is a dictionary-like collection of unique keys and their values. Also called associative arrays, they are similar to Arrays, but where an Array uses integers as its index, a Hash allows you to use any object type. You retrieve or create a new entry in a Hash by referring to its key. ...

obj[start:stop:step] slice(stop) slice(start, stop[, step]) ParamerDescriptionobjThe object that you want to extract a "sub-object" fromstartThe index of obj that you want the sub-object to start from (keep in mind that Python is zero-indexed, meaning that the first item of obj h...

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>)

Styles can be authored in several ways, allowing for varying degrees of reuse and scope when they are specified in a source HTML document. External stylesheets can be reused across HTML documents. Embedded stylesheets apply to the entire document in which they are specified. Inline styles apply on...

Xcode is an integrated development environment for macOS which supports the development of native apps for macOS, iOS, watchOS, and tvOS. Xcode is the successor to NeXT's Project Builder and PBX. (In fact, Xcode's project manifest files are still named with the .pbxproj extension.) Xcode releas...

AngularJS is a web application framework designed to simplify rich client-side application development. This documentation is for Angular 1.x, the predecessor of the more modern Angular 2 or see the Stack Overflow documentation for Angular 2. VersionRelease Date1.6.52017-07-031.6.42017-03-311....

With CSS you can set colors, gradients, and images as the background of an element. It is possible to specify various combinations of images, colors, and gradients, and adjust the size, positioning, and repetition (among others) of these. background-color: color | transparent | initial | inhe...

Jsoup is a HTML parsing and data extraction library for Java, focused on flexibility and ease of use. It can be used to extract sepecific data from HTML pages, which is commonly known as "web scraping", as well as modify the content of HTML pages, and "clean" untrusted HTML wit...

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...

VersionRelease Date0.991989-06-081.011989-06-232.01996-12-312.021998-04-202.031999-02-192.042001-03-212.05b2002-07-173.02004-08-033.12005-12-083.22006-10-114.02009-02-204.12009-12-314.22011-02-134.32014-02-264.42016-09-15