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What is the difference between git clone and checkout?
...e overwriting your a file in your working copy with a version of that file from another revision.
– svick
Sep 4 '11 at 10:44
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Creating an abstract class in Objective-C
...on of an abstract class, however. In fact, there is nothing to stop a user from providing implementations of abstract methods via a category (i.e. at runtime). You can force a user to at least override certain methods by raising an exception in those methods implementation in your abstract class:
[...
C++ Returning reference to local variable
... problem when returning reference to a local variable. How is it different from func2()?
3 Answers
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Global variables in Javascript across multiple files
...his JavaScript code I find myself in need of knowing if a certain function from helpers.js has been called.
8 Answers
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TypeError: 'NoneType' object is not iterable in Python
... Coding Style Guidelines - PEP-008
NoneTypes are Sneaky, and can sneak in from lambdas:
import sys
b = lambda x : sys.stdout.write("k")
for a in b(10):
pass #TypeError: 'NoneType' object is not iterable
NoneType is not a valid keyword:
a = NoneType #NameError: name 'NoneTy...
Find the most common element in a list
... and performance, a bonus 1-liner version with suitably mangled names:-).
from itertools import groupby as g
def most_common_oneliner(L):
return max(g(sorted(L)), key=lambda(x, v):(len(list(v)),-L.index(x)))[0]
share
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How to deal with cyclic dependencies in Node.js
... the end of your code. With this practice you will avoid almost all errors from circular dependencies.
– prieston
Jan 29 '18 at 11:11
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What is the most pythonic way to check if an object is a number?
...
Use Number from the numbers module to test isinstance(n, Number) (available since 2.6).
>>> from numbers import Number
... from decimal import Decimal
... from fractions import Fraction
... for n in [2, 2.0, Decimal('2.0'), co...
Dismissing a Presented View Controller
...ontroller
When a View Controller is presented modally, you can dismiss it (from the second view controller) by calling
// Swift
self.dismiss(animated: true, completion: nil)
// Objective-C
[self dismissViewControllerAnimated:YES completion:nil];
The documentation says,
The presenting view control...
What does it mean to hydrate an object?
...omain data ("real" data), and then populating it with domain data (such as from a database, from the network, or from a file system).
From Erick Robertson's comments on this answer:
deserialization == instantiation + hydration
If you don't need to worry about blistering performance, and you a...