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How to detect if app is being built for device or simulator in Swift
...ect iOS on a desktop architecture like follows
#if (arch(i386) || arch(x86_64)) && os(iOS)
...
#endif
After Swift 4.1 version
Latest use, now directly for all in one condition for all types of simulators need to apply only one condition -
#if targetEnvironment(simulator)
// ...
C++ sorting and keeping track of indexes
...; // std::iota
#include <algorithm> // std::sort, std::stable_sort
using namespace std;
template <typename T>
vector<size_t> sort_indexes(const vector<T> &v) {
// initialize original index locations
vector<size_t> idx(v.size());
iota(idx.begin(), id...
How can I connect to a Tor hidden service using cURL in PHP?
...
You need to set option CURLOPT_PROXYTYPE to CURLPROXY_SOCKS5_HOSTNAME, which sadly wasn't defined in old PHP versions, circa pre-5.6; if you have earlier in but you can explicitly use its value, which is equal to 7:
curl_setopt($ch, CURLOPT_PROXYTYPE, 7...
Rails raw SQL example
...
You can do this:
sql = "Select * from ... your sql query here"
records_array = ActiveRecord::Base.connection.execute(sql)
records_array would then be the result of your sql query in an array which you can iterate through.
...
How can I sanitize user input with PHP?
..., you must escape the string with MySQL's function for this purpose (mysqli_real_escape_string). (Or, in case of databases, using prepared statements are a better approach, when possible.)
Another example is HTML: If you embed strings within HTML markup, you must escape it with htmlspecialchars. Th...
Why use strict and warnings?
...ch as @ARGV, %ENV, and all the global punctuation variables such as $. or $_.
Declared with our (for a global) or my (for a lexical).
Imported from another package. (The use vars pragma fakes up an import, but use our instead.)
Fully qualified using its package name and the double-colon package sepa...
Force SSL/https using .htaccess and mod_rewrite
How can I force to SSL/https using .htaccess and mod_rewrite page specific in PHP.
9 Answers
...
What is the easiest way to remove the first character from a string?
... fastest and most readable way of doing things:
require 'benchmark'
N = 1_000_000
puts RUBY_VERSION
STR = "[12,23,987,43"
Benchmark.bm(7) do |b|
b.report('[0]') { N.times { "[12,23,987,43"[0] = '' } }
b.report('sub') { N.times { "[12,23,987,43".sub(/^\[+/, "") } }
b.report('gsub') { N.ti...
Getting a better understanding of callback functions in JavaScript
...epending how you call the function
alert(this);
};
callback(argument_1, argument_2);
callback.call(some_object, argument_1, argument_2);
callback.apply(some_object, [argument_1, argument_2]);
The method you choose depends whether:
You have the arguments stored in an Array or as distinct v...
How to create a density plot in matplotlib?
...
Sven has shown how to use the class gaussian_kde from Scipy, but you will notice that it doesn't look quite like what you generated with R. This is because gaussian_kde tries to infer the bandwidth automatically. You can play with the bandwidth in a way by changing the...