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How do I check if an object has a specific property in JavaScript?
... one should use the in operator or not. Also note that the in operator has excellent browser support IE 5.5+, Chrome 1.0+, Firefox 1.0+, Safari 3.0+ stackoverflow.com/questions/2920765/…
– Adrien Be
Oct 15 '14 at 7:42
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String to Dictionary in Python
...e built-in json module if you're on Python 2.6+, otherwise you can use the excellent third-party simplejson module.
import json # or `import simplejson as json` if on Python < 2.6
json_string = u'{ "id":"123456789", ... }'
obj = json.loads(json_string) # obj now contains a dict of the dat...
Should it be “Arrange-Assert-Act-Assert”?
...rd Assertion. You can find a detailed description of it on page 490 in the excellent book xUnit Test Patterns by Gerard Meszaros (highly recommended).
Normally, I don't use this pattern myself, since I find it more correct to write a specific test that validates whatever precondition I feel the nee...
What is SaaS, PaaS and IaaS? With examples
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Excellent answer.
– prashasthbaliga
Nov 19 '19 at 15:33
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What is the runtime performance cost of a Docker container?
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An excellent 2014 IBM research paper “An Updated Performance Comparison of Virtual Machines and Linux Containers” by Felter et al. provides a comparison between bare metal, KVM, and Docker containers. The general result is:...
jQuery equivalent of JavaScript's addEventListener method
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Here is an excellent treatment on the Mozilla Development Network (MDN) of this issue for standard JavaScript (if you do not wish to rely on jQuery or understand it better in general):
https://developer.mozilla.org/en-US/docs/DOM/eleme...
What is the difference between Cloud, Grid and Cluster? [closed]
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Excellent minimal explanation. +1
– Pale Blue Dot
Jul 5 '17 at 12:47
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UILabel sizeToFit doesn't work with autolayout ios6
.... That is the Content Hugging Priority. As Erica Sadun describes it in the excellent iOS Auto Layout Demystified, this is:
the way a view prefers to avoid extra padding around it's core content
For us, with the UILabel, the core content is the text.
Here we come to the heart of this basic sce...
Want to find records with no associated records in Rails
...s => { :id => nil } )
Update 3 - Rails 5
Thanks to @Anson for the excellent Rails 5 solution (give him some +1s for his answer below), you can use left_outer_joins to avoid loading the association:
Person.left_outer_joins(:contacts).where( contacts: { id: nil } )
I've included it here so...
What are '$$' used for in PL/pgSQL
...th single quotes in PostgreSQL
As to your second question:
Read the most excellent manual on CREATE FUNCTION to understand the last line of your example.
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