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How to sort an array based on the length of each element?
...
Based on Salman's answer, I've written a small function to encapsulate it:
function sortArrayByLength(arr, ascYN) {
arr.sort(function (a, b) { // sort array by length of text
if (ascYN) return ...
Rails - Validate Presence Of Association?
...Validations/ClassMethods/validates_presence_of
class A < ActiveRecord::Base
has_many :bs
validates_presence_of :bs
end
or just validates
http://apidock.com/rails/ActiveModel/Validations/ClassMethods/validates
class A < ActiveRecord::Base
has_many :bs
validates :bs, :presence => ...
How to convert an int to string in C?
...hmela
* Released under GPLv3.
*/
char* itoa(int value, char* result, int base) {
// check that the base if valid
if (base < 2 || base > 36) { *result = '\0'; return result; }
char* ptr = result, *ptr1 = result, tmp_char;
int tmp_value;
do {
tmp_value = value;
...
C# Java HashMap equivalent
... {
return null_value;
}
return base[key];
}
set
{
if (key == null)
{
null_value = value;
}
else
{
base[key] = value;
}
...
SQLAlchemy default DateTime
...lumn, Integer, DateTime
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class Test(Base):
__tablename__ = 'test'
id = Column(Integer, primary_key=True)
created_date = Column(DateTime, default=datetime.datetime.utcnow)
...
Removing item from vector, while in C++11 range 'for' loop?
...
No, you can't. Range-based for is for when you need to access each element of a container once.
You should use the normal for loop or one of its cousins if you need to modify the container as you go along, access an element more than once, or ot...
How to use the “number_to_currency” helper method in the model rather than view?
...hese currency formatter methods using things like this:
ActionController::Base.helpers.number_to_currency
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How to create Android Facebook Key Hash?
...eystore" | "C:\OpenSSL\bin\openssl" sha1 -binary |"C:\OpenSSL\bin\openssl" base64
it will ask for password, put android
that's all. u will get a key-hash
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Why is there no Tree class in .NET?
The base class library in .NET has some excellent data structures for collections (List, Queue, Stack, Dictionary), but oddly enough it does not contain any data structures for binary trees. This is a terribly useful structure for certain algorithms, such as those that take advantage of different tr...
Build the full path filename in Python
...ath name to a module. How do I build the file path from a directory name, base filename, and a file format string?
4 Answe...