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Ruby: Calling class method from instance
In Ruby, how do you call a class method from one of that class's instances? Say I have
9 Answers
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Auto start node.js server on boot
...alling a node express app as a service, and it's running (I get the output from the console.log calls in the *.out.log file), but when I try to get a response from the server via my web browser, I just get a 404 back.
– sanderd17
Oct 21 '16 at 10:53
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Search and replace a line in a file in Python
...es the content to a new file and replaces the old file with the new file:
from tempfile import mkstemp
from shutil import move, copymode
from os import fdopen, remove
def replace(file_path, pattern, subst):
#Create temp file
fh, abs_path = mkstemp()
with fdopen(fh,'w') as new_file:
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Why is auto_ptr being deprecated?
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I found the existing answers great, but from the PoV of the pointers. IMO, an ideal answer should have the user/programmer's perspective answer.
First thing first (as pointed by Jerry Coffin in his answer)
auto_ptr could be replaced by shared_ptr or unique_pt...
Difference between __getattr__ vs __getattribute__
...u can end up in infinite recursions very easily.
New-style classes derive from object, old-style classes are those in Python 2.x with no explicit base class. But the distinction between old-style and new-style classes is not the important one when choosing between __getattr__ and __getattribute__....
Convert Unix timestamp to a date string
Is there a quick, one-liner way to convert a Unix timestamp to a date from the Unix command line?
11 Answers
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Is there a ceiling equivalent of // operator in Python?
... (lossy) floating-point conversion.
Here's a demonstration:
>>> from __future__ import division # a/b is float division
>>> from math import ceil
>>> b = 3
>>> for a in range(-7, 8):
... print(["%d/%d" % (a, b), int(ceil(a / b)), -(-a // b)])
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['-7/3',...
Comparing Java enum members: == or equals()?
...out the order of your arguments (which only applies to comparing constants from the left, as in Pascal's answer)? Do you like always checking that a value is not null before .equals()ing it? I know I don't.
– Matt Ball
Nov 17 '09 at 21:03
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The 'Access-Control-Allow-Origin' header contains multiple values
... It seems like you are reading Properties.Settings.Default.Cors from a settings file. Can you post an example? And what class is UseCors in?
– Hoppe
Oct 21 '14 at 21:16
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How to remove and clear all localStorage data [duplicate]
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In some cases you might need to call it from the window object window.localStorage.clear();
– iamdevlinph
Aug 16 '18 at 7:15
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