explode and strstr are simpler methods to get substrings by separators.
A string containing several parts of text that are separated by a common character can be split into parts with the explode function.
$fruits = "apple,pear,grapefruit,cherry";
print_r(explode(",",$fruits))...
Simple split of an IP number string.
> (lispworks:split-sequence "." "127.0.0.1")
("127" "0" "0" "1")
Simple split of an URL:
> (lispworks:split-sequence ".:/" "http://127.0.0.1/foo/bar.html"
...
We cannot break a string into arbitrary points (because a System.Char may not be valid alone because it's a combining character or part of a surrogate) then code must take that into account (note that with length I mean the number of graphemes not the number of code-units):
public static IEnumerabl...
This example hides the red box (border) if the checkbox is not checked by making use of an IValueConverter.
Note: The BooleanToVisibilityConverter used in the example below is a built-in value converter, located in the System.Windows.Controls namespace.
XAML:
<Window x:Class="StackOverflo...
You can also use regular expressions to split a string. For example,
import re
data = re.split(r'\s+', 'James 94 Samantha 417 Scarlett 74')
print( data )
# Output: ['James', '94', 'Samantha', '417', 'Scarlett', '74']
If you have a string that contains Python literals, such as strings, floats etc, you can use ast.literal_eval to evaluate its value instead of eval. This has the added feature of allowing only certain syntax.
>>> import ast
>>> code = """(1, 2, {'foo': 'bar'})"...
It is not possible to use eval or exec to execute code from untrusted user securely. Even ast.literal_eval is prone to crashes in the parser. It is sometimes possible to guard against malicious code execution, but it doesn't exclude the possibility of outright crashes in the parser or the tokenizer....
Now we'll try going for a little more complex example, using the capabilities of the controller to fill in the view.
Here is our view:
/application/views/hello_world.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<titl...
Two sequences whose corresponding elements are equal and which have the same number of elements are considered equal.
SequenceEqual
Determines whether two sequences are equal by comparing elements in a pair-wise manner.
Method Syntax
// SequenceEqual
var numbers1 = new int[] { 1, 2, 3, 4,...
JSON stands for "JavaScript Object Notation", but it's not JavaScript. Think of it as just a data serialization format that happens to be directly usable as a JavaScript literal. However, it is not advisable to directly run (i.e. through eval()) JSON that is fetched from an external source...
Equality operatorSucceeds ifX = YX can be unified with YX \= YX cannot be unified with YX == YX and Y are identical (i.e. they unify with no variable bindings occurring)X \== YX and Y are not identicalX =:= YX and Y are arithmetically equalX =\= YX and Y are not arithmetically equal
Immutability is common in functional programming and rare in object oriented programming.
Create, for example, an address type with mutable state:
public class Address ()
{
public string Line1 { get; set; }
public string Line2 { get; set; }
public string City { get; set; }
}
...
Python has several functions built into the interpreter.
If you want to get information of keywords, built-in functions, modules or topics open a Python console and enter:
>>> help()
You will receive information by entering keywords directly:
>>> help(help)
or within the u...
trait HelloWorld {
public function sayHello() {
echo 'Hello World!';
}
}
// Change visibility of sayHello
class MyClass1 {
use HelloWorld { sayHello as protected; }
}
// Alias method with changed visibility
// sayHello visibility not changed
class MyClass2 {
u...
