Before reading and writing text files you should know what encoding to use. See the Perl Unicode Documentation for more details on encoding. Here we show the setting of UTF-8 as the default encoding and decoding for the function open. This is done by using the open pragma near the top of your code (...
HTML Import caching will sometimes mean that changes made to HTML files that get imported do not get reflected upon browser refresh. Take the following import as an example:
<link rel="import" href="./my-element.html">
If a change is done to my-element.html after previo...
The NodeIterator interface provides methods for iterating over nodes in a DOM tree.
Given a document like this one:
<html>
<body>
<section class="main">
<ul>
<li>List Item</li>
<li>List Item</li>
<li>Li...
Modern browsers provide a classList object to ease manipulation of the element's class attribute. Older browsers require direct manipulation of the element's className property.
* Note class names are not stored in the element's property in any particular order
W3C DOM4
Removing one class from an...
Modern browsers provide a classList object to ease manipulation of the element's class attribute. Older browsers require direct manipulation of the element's className property.
* Note class names are not stored in the element's property in any particular order
W3C DOM4
Testing if an element cont...
In MySQL and other SQL dialects, NULL values have special properties.
Consider the following table containing job applicants, the companies they worked for, and the date they left the company. NULL indicates that an applicant still works at the company:
CREATE TABLE example
(`applicant_id` INT, `...
SELECT 1,22,44
UNION
SELECT 2,33,55
SELECT 1,22,44
UNION
SELECT 2,33,55
UNION
SELECT 2,33,55
The result is the same as above.
use UNION ALL
when
SELECT 1,22,44
UNION
SELECT 2,33,55
UNION ALL
SELECT 2,33,55
In InnoDB, having a long PRIMARY KEY (either a single column with a
lengthy value, or several columns that form a long composite value)
wastes a lot of disk space. The primary key value for a row is duplicated in all the secondary index records that point to the same
row. Create an AUTO_INCREME...
You may want to re-seed your database without affecting your previously created seeds. For this purpose, you can use firstOrCreate in your seeder:
EmployeeType::firstOrCreate([
'type' => 'manager',
]);
Then you can seed the database:
php artisan db:seed
Later, if you want to add a...
The correct invocation of helper modules and functions can be intimidating because
these are generated dynamically (e.g., when creating a new project or adding a new resource)
they are not documented explicitly (e.g., MyApp.ErrorHelpers.error_tag)
the documentation does not cover all examples (...
To automatically reload vimrc upon save, add the following to your vimrc:
if has('autocmd') " ignore this section if your vim does not support autocommands
augroup reload_vimrc
autocmd!
autocmd! BufWritePost $MYVIMRC,$MYGVIMRC nested source %
augroup END
endif
a...
The Ruby Version Manager is a command line tool to simply install and manage different versions of Ruby.
rvm istall 2.3.1 for example installs Ruby version 2.3.1 on your machine.
With rvm list you can see which versions are installed and which is actually set for use.
user@dev:~$ rvm li...
To integrate Siri capabilities in your app, you should add an extensions as you would do while creating an iOS 10 Widget (old Today View Extension) or a custom keyboard.
Adding capability
1- In the project settings, select your iOS app target and go to Capabilities tab
2- Enable the Siri capabili...
Method 1:
proc sql;
create table foo like sashelp.class;
quit;
Method 2:
proc sql;
create table bar as
select * from sashelp.class (obs=0);
quit;
Method 1 should be the preferred option
PROC SQL options;
SELECT column(s)
FROM table-name | view-name
WHERE expression
GROUP BY column(s)
HAVING expression
ORDER BYcolumn(s);
QUIT;
Example 1:
proc sql;
select name
,sex
from sashelp.class ;
quit;
The SELECT statement is specified in this order :
1....
DECLARE
v_num1 NUMBER(10);
v_num2 NUMBER(10);
BEGIN
v_num1 := 2;
v_num2 := 1;
IF v_num1 > v_num2 THEN
dbms_output.put_line('v_num1 is bigger than v_num2');
END IF;
END;
DECLARE
v_num1 NUMBER(10);
v_num2 NUMBER(10);
BEGIN
v_num1 := 2;
v_num2 := 10;
IF v_num1 > v_num2 THEN
dbms_output.put_line('v_num1 is bigger than v_num2');
ELSE
dbms_output.put_line('v_num1 is NOT bigger than v_num2');
END IF;
END;
DECLARE
v_num1 NUMBER(10);
v_num2 NUMBER(10);
BEGIN
v_num1 := 2;
v_num2 := 2;
IF v_num1 > v_num2 THEN
dbms_output.put_line('v_num1 is bigger than v_num2');
ELSIF v_num1 < v_num2 THEN
dbms_output.put_line('v_num1 is NOT bigger than v_num2');
ELSE
dbms_out...
Importing the framework
Swift
import Contacts
Objective-C
#import <Contacts/Contacts.h>
Checking accessibility
Swift
switch CNContactStore.authorizationStatusForEntityType(CNEntityType.Contacts){
case .Authorized: //access contacts
case .Denied, .NotDetermined: //request permissio...
