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How do I set up a simple delegate to communicate between two view controllers?
...nto your SecondVC
protocol DataDelegate {
func sendData(data : String)
}
class ViewControllerB : UIViewController {
//Declare the delegate property in your SecondVC
var delegate : DataDelegate?
var data : String = "Send data to ViewControllerA."
over...
Error installing mysql2: Failed to build gem native extension
...erate views and controllers)
rails generate scaffold city ID:integer Name:string CountryCode:string District:string Population:integer
Edit the file c:\Sites\world\app\models\city.rb to look like this
class City < ActiveRecord::Base
set_table_name "city"
end
Edit the file c:\Sites\world\c...
Difference between “process.stdout.write” and “console.log” in node.js?
...'t put the break line at the end you will get a weird character after your string, something like this:
process.stdout.write("Hello World"); //Hello World%
(I think that means something like "the end of the program", so you will see it only if you process.stdout.write was used at the end of your...
How do I programmatically change file permissions?
...issions using EnumSet.of(), but the helper method PosixFilePermissions.fromString() will uses a conventional format that will be more readable to many developers. For APIs that accept a FileAttribute, you can wrap the set of permissions with with PosixFilePermissions.asFileAttribute().
Set<Posix...
How to make a chain of function decorators?
...udes the function functools.wraps(), which copies the name, module, and docstring of the decorated function to its wrapper.
(Fun fact: functools.wraps() is a decorator! ☺)
# For debugging, the stacktrace prints you the function __name__
def foo():
print("foo")
print(foo.__name__)
#outputs:...
How to ISO 8601 format a Date with Timezone Offset in JavaScript?
...all browsers (thanks to @MattJohnson for the tip)
Date.prototype.toIsoString = function() {
var tzo = -this.getTimezoneOffset(),
dif = tzo >= 0 ? '+' : '-',
pad = function(num) {
var norm = Math.floor(Math.abs(num));
return (norm < 10 ? '0'...
How to sort an array based on the length of each element?
... method to sort the array. A sorting function that considers the length of string as the sorting criteria can be used as follows:
arr.sort(function(a, b){
// ASC -> a.length - b.length
// DESC -> b.length - a.length
return b.length - a.length;
});
Note: sorting ["a", "b", "c"] by l...
Download file from an ASP.NET Web API method using AngularJS
... return new HttpResponseMessage(HttpStatusCode.BadRequest);
string path = ConfigurationManager.AppSettings["QRFolder"] + + QRFile.QRId + @"\" + QRFile.FileName;
if (!File.Exists(path))
return new HttpResponseMessage(HttpStatusCode.BadRequest);
HttpResponse...
Truncating all tables in a Postgres database
...() requires Postgres 9.1 or later. In older versions concatenate the query string like this:
'TRUNCATE TABLE ' || quote_ident(_sch) || '.' || quote_ident(_tbl) || ' CASCADE';
Single command, no loop
Since we can TRUNCATE multiple tables at once we don't need any cursor or loop at all:
Passing...
Paging with Oracle
... and java. The paging code looks like this:
public public List<Map<String, Object>> getAllProductOfferWithPagination(int pageNo, int pageElementSize, Long productOfferId, String productOfferName) {
try {
if(pageNo==1){
//do nothing
} else{
p...