It is possible to emulate container types, which support accessing values by key or index.
Consider this naive implementation of a sparse list, which stores only its non-zero elements to conserve memory.
class sparselist(object):
def __init__(self, size):
self.size = size
se...
Jsoup can be used to extract links and email address from a webpage, thus "Web email address collector bot" First, this code uses a Regular expression to extract the email addresses, and then uses methods provided by Jsoup to extract the URLs of links on the page.
public class JSoupTest {...
This example uses the Cars Table from the Example Databases.
UPDATE Cars
SET Status = 'READY'
This statement will set the 'status' column of all rows of the 'Cars' table to "READY" because it does not have a WHERE clause to filter the set of rows.
This example uses the Cars Table from the Example Databases.
UPDATE
Cars
SET
Status = 'READY'
WHERE
Id = 4
This statement will set the status of the row of 'Cars' with id 4 to "READY".
WHERE clause contains a logical expression which is evaluated for each row. If a...
This example uses the Cars Table from the Example Databases.
UPDATE Cars
SET TotalCost = TotalCost + 100
WHERE Id = 3 or Id = 4
Update operations can include current values in the updated row. In this simple example the TotalCost is incremented by 100 for two rows:
The TotalCost of Car #3 i...
The general syntax for declaring a one-dimensional array is
type arrName[size];
where type could be any built-in type or user-defined types such as structures, arrName is a user-defined identifier, and size is an integer constant.
Declaring an array (an array of 10 int variables in this case) i...
Sometimes it's necessary to set an array to zero, after the initialization has been done.
#include <stdlib.h> /* for EXIT_SUCCESS */
#define ARRLEN (10)
int main(void)
{
int array[ARRLEN]; /* Allocated but not initialised, as not defined static or global. */
size_t i;
for(i ...
Accessing array values is generally done through square brackets:
int val;
int array[10];
/* Setting the value of the fifth element to 5: */
array[4] = 5;
/* The above is equal to: */
*(array + 4) = 5;
/* Reading the value of the fifth element: */
val = array[4];
As a side effect of...
You can filter what routes are available using constraints.
There are several ways to use constraints including:
segment constraints,
request based constraints
advanced constraints
For example, a requested based constraint to only allow a specific IP address to access a route:
constraints(...
String literals in Swift are delimited with double quotes ("):
let greeting = "Hello!" // greeting's type is String
Characters can be initialized from string literals, as long as the literal contains only one grapheme cluster:
let chr: Character = "H" // valid
let chr...
Git will usually open an editor (like vim or emacs) when you run git commit. Pass the -m option to specify a message from the command line:
git commit -m "Commit message here"
Your commit message can go over multiple lines:
git commit -m "Commit 'subject line' message here
Mor...
var a = Math.random();
Sample value of a: 0.21322848065742162
Math.random() returns a random number between 0 (inclusive) and 1 (exclusive)
function getRandom() {
return Math.random();
}
To use Math.random() to get a number from an arbitrary range (not [0,1)) use this function to get a...
The attribute tools:ignore can be used in xml files to dismiss lint warnings.
BUT dismissing lint warnings with this technique is most of the time the wrong way to proceed.
A lint warning must be understood and fixed... it can be ignored if and only if you have a full understanding of it's meaning...
Extensions can contain functions and computed/constant get variables. They are in the format
extension ExtensionOf {
//new functions and get-variables
}
To reference the instance of the extended object, self can be used, just as it could be used
To create an extension of String that adds ...
Extensions can contain convenience initializers. For example, a failable initializer for Int that accepts a NSString:
extension Int {
init?(_ string: NSString) {
self.init(string as String) // delegate to the existing Int.init(String) initializer
}
}
let str1: NSString = &qu...
This example show how to subscribe, and once that is successful, publishing a message to that channel. It also demonstrates the full set of parameters that can be included in the subscribe's message callback function.
pubnub = PUBNUB({
publish_key : 'your_pub_key',
...
# No import needed
# No import required...
from functools import reduce # ... but it can be loaded from the functools module
from functools import reduce # mandatory
reduce reduces an iterable by applying a function repeatedly on the next element of an iterable and the cumulative resul...
def multiply(s1, s2):
print('{arg1} * {arg2} = {res}'.format(arg1=s1,
arg2=s2,
res=s1*s2))
return s1 * s2
asequence = [1, 2, 3]
Given an initializer the function is started by applying it to the...
