Tutorial by Examples: g

The macro WITH-INPUT-FROM-STRING can be used to make a stream from a string. (with-input-from-string (str "Foobar") (loop for i from 0 for char = (read-char str nil nil) while char do (format t "~d: ~a~%" i char))) ; 0: F ; 1: o ; 2: o ; 3: b ;...

The macro WITH-OUTPUT-TO-STRING can be used to create a string output stream, and return the resulting string at the end. (with-output-to-string (str) (write-line "Foobar!" str) (write-string "Barfoo!" str)) ;=> "Foobar! ; Barfoo!" The same can be done ...

Gray streams are a non-standard extension that allows user defined streams. It provides classes and methods that the user can extend. You should check your implementations manual to see if it provides Gray streams. For a simple example, a character input stream that returns random characters could ...

A file can be opened for reading as a stream using WITH-OPEN-FILE macro. (with-open-file (file #P"test.file") (loop for i from 0 for line = (read-line file nil nil) while line do (format t "~d: ~a~%" i line))) ; 0: Foobar ; 1: Barfoo ; 2: Quuxbar...

A file can be opened for writing as a stream using WITH-OPEN-FILE macro. (with-open-file (file #P"test.file" :direction :output :if-exists :append :if-does-not-exist :create) (dolist (line '("Foobar" &q...

Method stopLoading() stops the current loading process of the webview. Swift webview.stopLoading() Objective-C [webview stopLoading];

Don't put comments after mappings, it will break things. Use :map <F6> to see what is mapped to <F6> and in which mode. Use :verbose map <F6> to also see where it was last mapped. :map and :map! are too generic. Use :n[nore]map for normal mode mappings, :i[nore]map for insert ...

Autocommand groups are good for organization but they can be useful for debugging too. Think of them as small namespaces that you can enable/disable at will. Example augroup MyGroup " Clear the autocmds of the current group to prevent them from piling " up each time you rel...

Some formats can take additional parameters, such as the width of the formatted string, or the alignment: >>> '{:.>10}'.format('foo') '.......foo' Those can also be provided as parameters to format by nesting more {} inside the {}: >>> '{:.>{}}'.format('foo', 10) '.......

Avoid Ambiguity The name of classes, structures, functions and variables should avoid ambiguity. Example: extension List { public mutating func remove(at position: Index) -> Element { // implementation } } The function call to this function will then look like this: li...

Using natural language Functions calls should be close to natural English language. Example: list.insert(element, at: index) instead of list.insert(element, position: index) Naming Factory Methods Factory methods should begin with the prefix `make`. Example: factory.makeObject() ...

By default, one should subscribe to event using inspector, but sometimes it's better to do it in code. In this example we subscribe to click event of a button in order to handle it. using UnityEngine; using UnityEngine.UI; [RequireComponent(typeof(Button))] public class AutomaticClickHandler :...

The angular.equals function compares and determines if 2 objects or values are equal, angular.equals performs a deep comparison and returns true if and only if at least 1 of the following conditions is met. angular.equals(value1, value2) If the objects or values pass the === comparison If b...

The function angular.isString returns true if the object or value given to it is of the type string angular.isString(value1) Examples angular.isString("hello") // true angular.isString([1, 2]) // false angular.isString(42) // false This is the equivalent of performing typeof s...

The angular.isArray function returns true if and only if the object or value passed to it is of the type Array. angular.isArray(value) Examples angular.isArray([]) // true angular.isArray([2, 3]) // true angular.isArray({}) // false angular.isArray(17) // false It is the equivalent of ...

In cases such as restoring a database dump, or otherwise wishing to push some information through a pipe from the host, you can use the -i flag as an argument to docker run or docker exec. E.g., assuming you want to put to a containerized mariadb client a database dump that you have on the host, in...

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docker inspect <image> The output is in JSON format. You can use jq command line utility to parse and print only the desired keys. docker inspect <image> | jq -r '.[0].Author' The above command will shows author name of the images.

Example for date or time range.

To split a JID into its component parts (the localpart, domainpart, and resourcepart), the following algorithm should be used (where the localpart is represented by lp, the resourcepart by rp, and the domainpart by dp and ∈ is used to check if the given character is included in the string): Note ...