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How to detect the currently pressed key?
...
if ((Control.ModifierKeys & Keys.Shift) != 0)
This will also be true if Ctrl+Shift is down. If you want to check whether Shift alone is pressed,
if (Control.ModifierKeys == Keys.Shift)
If you're in a class that inh...
Determine whether JSON is a JSONObject or JSONArray
...ich it will be. I need to work with the JSON, but to do so, I need to know if it is an Object or an Array.
8 Answers
...
Correctly determine if date string is a valid date in that format
...
If you are using PHP 5.2.x, you should use strtotime to get the unix timestamp then date('Y-m-d', $t) to get the string date. Then you compare them just like this answer.
– pedromanoel
J...
Javascript: best Singleton pattern [duplicate]
...rsion
class Singleton {
static instance;
constructor() {
if (instance) {
return instance;
}
this.instance = this;
}
foo() {
// ...
}
}
console.log(new Singleton() === new Singleton());
(2) ES6 Version
class Singleton {
const...
do..end vs curly braces for blocks in Ruby
...-line blocks and curly braces for single line blocks, but there is also a difference between the two that can be illustrated with this example:
puts [1,2,3].map{ |k| k+1 }
2
3
4
=> nil
puts [1,2,3].map do |k| k+1; end
#<Enumerator:0x0000010a06d140>
=> nil
This means that {} has a high...
Check if a string contains one of 10 characters
I'm using C# and I want to check if a string contains one of ten characters, *, &, # etc etc.
6 Answers
...
Test if string is a number in Ruby on Rails
...is_number? Method.
Create a helper method:
def is_number? string
true if Float(string) rescue false
end
And then call it like this:
my_string = '12.34'
is_number?( my_string )
# => true
Extend String Class.
If you want to be able to call is_number? directly on the string instead of pa...
How does Dijkstra's Algorithm and A-Star compare?
...f each node is calculated by f(x)=g(x)+h(x)
A* search only expands a node if it seems promising. It only focuses to reach the goal node from the current node, not to reach every other nodes. It is optimal, if the heuristic function is admissible.
So if your heuristic function is good to approximat...
close vs shutdown socket?
In C, I understood that if we close a socket, it means the socket will be destroyed and can be re-used later.
9 Answers
...
Fragment onResume() & onPause() is not called on backstack
...They are tightly coupled to the Activity.
Read the Handling the Fragment Lifecycle section of this article.
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