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Why does .NET foreach loop throw NullRefException when collection is null?
...an be extended further in interesting ways (for loops, reversing, leaping, etc). Thanks for sharing.
– Lara
Feb 16 '17 at 17:08
...
Replace multiple strings with multiple other strings
...e sentence as are defined in the arrayOfWords
// use python type {0}, {1} etc notation
// five to replace
const sentence2 = '{0} is {1} and {2} are {3} every {5}'
// but four in array? doesn't break
const words2 = ['man','dumb','plants','smart']
// what happens ?
const result2 = words2....
Functional programming vs Object Oriented programming [closed]
...s very lightweight memory-speaking since most methods are just references. Etc...
– Erik Reppen
Nov 23 '13 at 0:55
...
Clearing purchases from iOS in-app purchase sandbox for a test user
...r changes to app state for this purchase,
// register in keychain, etc.
break ;
//.. other cases
}
}
}
The question of having your app logic / take back the purchase is simple: if you're caching purchases in keychain, delete your keychain. If you're doing it some ot...
Fastest way to check if a string matches a regexp in ruby?
...remove anchors, try limiting searches, use wildcards vs. explicit matches, etc.
The Fruity gem is very useful for quickly benchmarking things, because it's smart. Ruby's built-in Benchmark code is also useful, though you can write tests that fool you by not being careful.
I've used both in many an...
boolean in an if statement
...on-zero number, any non-empty string value, any object or array reference, etc...
On the other hand:
if (booleanValue === true)
This will only satisfy the if condition if booleanValue is exactly equal to true. No other truthy value will satisfy it.
On the other hand if you do this:
if (someV...
How to set up tmux so that it starts up with specified windows opened?
...t needed. Remove to use default socket
rvm: 1.9.2@rails_project
pre: sudo /etc/rc.d/mysqld start
tabs:
- editor:
layout: main-vertical
panes:
- vim
- #empty, will just run plain bash
- top
- shell: git pull
- database: rails db
- server: rails s
- logs: ...
if A vs if A is not None:
... And many other values too, such as empty list, empty set, empty tuple etc. Essentially, anything that is not truthy per docs.python.org/3/library/stdtypes.html#truth-value-testing.
– jarmod
Dec 4 '19 at 23:46
...
What must I know to use GNU Screen properly? [closed]
...e ground up. What are some analogies and handy tips for remembering binds, etc.?
18 Answers
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Base64 length calculation?
...ubles because we don't want to use the floating point ops, rounding errors etc. They are just not necessary.
For this it is a good idea to remember how to perform the ceiling division: ceil(x / y) in doubles can be written as (x + y - 1) / y (while avoiding negative numbers, but beware of overflow)...