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Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
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mkenyon
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answered Jun 3 '11 at 8:57
Andrew GrimmAndrew Grimm
67.5k464...
Save image from URL by paperclip
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154
Here is a simple way:
require "open-uri"
class User < ActiveRecord::Base
has_attached_fi...
How to escape JSON string?
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edited Apr 24 '17 at 9:25
David Walschots
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answer...
How to toggle a value in Python
...rom the total is a simple and fast way to toggle values:
>>> A = 5
>>> B = 3
>>> total = A + B
>>> x = A
>>> x = total - x # toggle
>>> x
3
>>> x = total - x # toggle
>>> x
5
>>> x = total - x # toggle
>>...
Finding duplicates in O(n) time and O(1) space
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165
This is what I came up with, which doesn't require the additional sign bit:
for i := 0 to n - 1...
How to export iTerm2 Profiles
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jcollum
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answered Apr 29 '14 at 5:20
Ask and LearnAsk and Learn
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How can I find script's directory with Python? [duplicate]
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Czarek TomczakCzarek Tomczak
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Remove DEFINER clause from MySQL Dumps
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answered Feb 25 '12 at 19:16
AbhayAbhay
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Creating NSData from NSString in Swift
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– Gabriele Petronella
Sep 21 '14 at 16:57
3
In Swift2, there's no need to use "as" cast since it's a...
Python strftime - date without leading 0?
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591
Actually I had the same problem and I realized that, if you add a hyphen between the % and the...