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Test if string is a number in Ruby on Rails
...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 passing it as a param to your helper f...
ng-app vs. data-ng-app, what is the difference?
...follows:
Strip x- and data- from the front of the element/attributes. Convert the :, -, or _-delimited name to camelCase. Here are some equivalent
examples of elements that match ngBind:
based on above statement below all are valid directives
1. ng-bind
2. ng:bind
3. ng_bind
4. data-ng...
Byte order mark screws up file reading in Java
...lar to solutions posted in SUN's bug database. Incorporate it in your code and you're fine.
/* ____________________________________________________________________________
*
* File: UnicodeBOMInputStream.java
* Author: Gregory Pakosz.
* Date: 02 - November - 2005
* ________________...
How to get the index of an item in a list in a single step?
...
EDIT: If you're only using a List<> and you only need the index, then List.FindIndex is indeed the best approach. I'll leave this answer here for those who need anything different (e.g. on top of any IEnumerable<>).
Use the overload of Select which takes...
The difference between sys.stdout.write and print?
...
print first converts the object to a string (if it is not already a string). It will also put a space before the object if it is not the start of a line and a newline character at the end.
When using stdout, you need to convert the obje...
How to escape JSON string?
... I cannot reproduce this method for deserializing an encoded and escaped unc path. My path "WatchedPath": "\\\\myserver\\output" becomes "\"\\\\\\\\myserver\\\\output\"" which is pretty unacceptable.
– slestak
Dec 29 '14 at 14:36
...
How to check type of variable in Java?
...pe).
The examples you gave (int, array, double) these are all primitives, and there are no sub-types of them. Thus, if you declare a variable to be an int:
int x;
You can be sure it will only ever hold int values.
If you declared a variable to be a List, however, it is possible that the variab...
Why was “Avoid Enums Where You Only Need Ints” removed from Android's performance tips?
...was removed from the official developer documentation . (See Why doesn't Android use more enums? for the old section content)
...
What does static_assert do, and what would you use it for?
...n example where static_assert(...) ('C++11') would solve the problem in hand elegantly?
8 Answers
...
Inheriting constructors
...
If your compiler supports C++11 standard, there is a constructor inheritance using using (pun intended). For more see Wikipedia C++11 article. You write:
class A
{
public:
explicit A(int x) {}
};
class B: public A
{
using A::A;
};
This i...