In general, most of the objects you would interact with as a user would tend to be a vector; e.g numeric vector, logical vector. These objects can only take in a single type of variable (a numeric vector can only have numbers inside it).
A list would be able to store any type variable in it, making...
The emptiness of a list is associated to the boolean False, so you don't have to check len(lst) == 0, but just lst or not lst
lst = []
if not lst:
print("list is empty")
# Output: list is empty
You can add items to a user's Reading List in Safari by calling the addItem method on the SSReadingList singleton.
let readingList = SSReadingList.default()
readingList?.addItem(with: yourURL, title: "optional title", previewText: "optional preview text")
The default Reading...
Say you have a library website, and you want to have a custom post type named Books. It can be registered as
function create_bookposttype() {
$args = array(
'public' => true,
'labels' => array(
'name' => __( 'Books' ),
'singular_name' => ...
unique drops duplicates so that each element in the result is unique (only appears once):
x = c(2, 1, 1, 2, 1)
unique(x)
# 2 1
Values are returned in the order they first appeared.
duplicated tags each duplicated element:
duplicated(x)
# FALSE FALSE TRUE TRUE TRUE
anyDuplicated(x) >...
Sets are unordered collections of distinct elements. But sometimes we want to work with unordered collections of elements that are not necessarily distinct and keep track of the elements' multiplicities.
Consider this example:
>>> setA = {'a','b','b','c'}
>>> setA
set(['a', 'c'...
A list is denoted by parentheses:
()
;;=> ()
A Clojure list is a singly linked list. conj "conjoins" a new element to the collection in the most efficient location. For lists, this is at the beginning:
(conj () :foo)
;;=> (:foo)
(conj (conj () :bar) :foo)
;;=> (:foo :ba...
For if you have to fine-tune what is published.
import { Mongo } from 'meteor/mongo';
import { Meteor } from 'meteor/meteor';
import { Random } from 'meteor/random';
if (Meteor.isClient) {
// established this collection on the client only.
// a name is required (first parameter) and this...
It is possible to create a function that accepts objects that implement a specific trait.
Static Dispatch
fn generic_speak<T: Speak>(speaker: &T) {
println!("{0}", speaker.speak());
}
fn main() {
let person = Person {};
let dog = Dog {};
generic_speak(...
Adding the DebuggerDisplay Attribute will change the way the debugger displays the class when it is hovered over.
Expressions that are wrapped in {} will be evaluated by the debugger. This can be a simple property like in the following sample or more complex logic.
[DebuggerDisplay("{StringPr...
git stash list
This will list all stashes in the stack in reverse chronological order.
You will get a list that looks something like this:
stash@{0}: WIP on master: 67a4e01 Merge tests into develop
stash@{1}: WIP on master: 70f0d95 Add user role to localStorage on user login
You can refer t...
Travis CI has CMake 2.8.7 pre-installed.
A minimal .travis.yml script for an out-of source build
language: cpp
compiler:
- gcc
before_script:
# create a build folder for the out-of-source build
- mkdir build
# switch to build directory
- cd build
# run cmake; here we assume...
The CMake version preinstalled on Travis is very old. You can use the official Linux binaries to build with a newer version.
Here is an example .travis.yml:
language: cpp
compiler:
- gcc
# the install step will take care of deploying a newer cmake version
install:
# first we creat...
The display CSS property is fundamental for controlling the layout and flow of an HTML document. Most elements have a default display value of either block or inline (though some elements have other default values).
Inline
An inline element occupies only as much width as necessary. It stacks horiz...
There are few approaches available there:
You can subscribe for keyboard appearance events notifications and change offset manually:
//Swift 2.0+
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(YourVCClas...
Look at the contents of /etc/redhat-release
cat /etc/redhat-release
Here is the output from a Fedora 24 machine: Fedora release 24 (Twenty Four)
As mentioned in the debian-based response, you can also use the lsb_release -a command, which outputs this from a Fedora 24 machine:
LSB Version: ...
