There are 4 looping constructs in Rust. All examples below produce the same output.
Infinite Loops
let mut x = 0;
loop {
if x > 3 { break; }
println!("{}", x);
x += 1;
}
While Loops
let mut x = 0;
while x <= 3 {
println!("{}", x);
x += 1;
...
fn main() {
// Statically allocated string slice
let hello = "Hello world";
// This is equivalent to the previous one
let hello_again: &'static str = "Hello world";
// An empty String
let mut string = String::new();
// An empty String ...
foo = 1
bar = 'bar'
baz = 3.14
You can use str.format to format output. Bracket pairs are replaced with arguments in the order in which the arguments are passed:
print('{}, {} and {}'.format(foo, bar, baz))
# Out: "1, bar and 3.14"
Indexes can also be specified inside the bracket...
Statistical functions in R make heavy use of the so-called Wilkinson-Rogers formula notation1 .
When running model functions like lm for the Linear Regressions, they need a formula. This formula specifies which regression coefficients shall be estimated.
my_formula1 <- formula(mpg ~ wt)
class(...
TypeScript is a typed superset of JavaScript, which means that all JavaScript code is valid TypeScript code. TypeScript adds a lot of new features on top of that.
TypeScript makes JavaScript more like a strongly-typed, object-oriented language akin to C# and Java. This means that TypeScript code te...
In Python 3 str is the type for unicode-enabled strings, while bytes is the type for sequences of raw bytes.
type("f") == type(u"f") # True, <class 'str'>
type(b"f") # <class 'bytes'>
In Python 2 a casual string was a sequence of raw byte...
SelectorDescription*Universal selector (all elements)divTag selector (all <div> elements).blueClass selector (all elements with class blue).blue.redAll elements with class blue and red (a type of Compound selector)#headlineID selector (the element with "id" attribute set to headline)...
First, remove autopublish. autopublish automatically publishes the entire database to the client-side, and so the effects of publications and subscriptions cannot be seen.
To remove autopublish:
$ meteor remove autopublish
Then you can create publications. Below is a full example.
import { Mon...
In Python 3 and higher, print is a function rather than a keyword.
print('hello world!')
# out: hello world!
foo = 1
bar = 'bar'
baz = 3.14
print(foo)
# out: 1
print(bar)
# out: bar
print(baz)
# out: 3.14
You can also pass a number of parameters to print:
print(foo, bar, b...
LINQ is largely beneficial for querying collections (or arrays).
For example, given the following sample data:
var classroom = new Classroom
{
new Student { Name = "Alice", Grade = 97, HasSnack = true },
new Student { Name = "Bob", Grade = 82, HasSnack = false },
...
From MSDN:
An enumeration type (also named an enumeration or an enum) provides an efficient way to define a set of named integral constants that may be assigned to a variable.
Essentially, an enum is a type that only allows a set of finite options, and each option corresponds to a number. By d...
Once connected you can publish messages by calling the ISubscriber.Publish method:
// grab an instance of an ISubscriber
var subscriber = connection.GetSubscriber();
// publish a message to the 'chat' channel
subscriber.Publish("chat", "This is a message")
Consumers can ...
Backbone requires Underscore and (optionally) jQuery - for DOM manipulation (using Backbone.View) and RESTful persistence.
The quickest way to get up and running with Backbone is to create an index.html file with simple script tags in the HTML <head>:
<html>
<head>
...
Event Emitters are built into Node, and are for pub-sub, a pattern where a publisher will emit events, which subscribers can listen and react to. In Node jargon, publishers are called Event Emitters, and they emit events, while subscribers are called listeners, and they react to the events.
// Requ...
Scala has a special type of function called a partial function, which extends normal functions -- meaning that a PartialFunction instance can be used wherever Function1 is expected. Partial functions can be defined anonymously using case syntax also used in pattern matching:
val pf: PartialFunction...
Generics are placeholders for types, allowing you to write flexible code that can be applied across multiple types. The advantage of using generics over Any is that they still allow the compiler to enforce strong type-safety.
A generic placeholder is defined within angle brackets <>.
Generic...
Suppose we have a list of teams, named like this: Team A, Team B, ..., Team Z. Then:
Team [AB]: This will match either either Team A or Team B
Team [^AB]: This will match any team except Team A or Team B
We often need to match characters that "belong" together in some context or ano...
State in React components is essential to manage and communicate data in your application. It is represented as a JavaScript object and has component level scope, it can be thought of as the private data of your component.
In the example below we are defining some initial state in the constructor f...
