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Check if bash variable equals 0 [duplicate]
... @pavel, [ is a bash built-in, see gnu.org/software/bash/manual/html_node/…
– Nicholas Sushkin
Feb 3 '16 at 16:46
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ADO.NET DataRow - check for column existence
How do I check for the existence of a column in a datarow?
2 Answers
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How to generate controller inside namespace in rails
I have namespace admin in controller, and I want to generate a controller inside of the admin folder. How can i do it with a Rails command?
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Multiline comment in PowerShell
Can we comment multiple lines together in PowerShell?
2 Answers
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What's the best way to learn LISP? [closed]
...e Arc is its own dialect of Lisp, not just a framework. paulgraham.com/arc.html
– michiakig
Aug 27 '10 at 15:31
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How to test if parameters exist in rails
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use blank? http://api.rubyonrails.org/classes/Object.html#method-i-blank-3F
unless params[:one].blank? && params[:two].blank?
will return true if its empty or nil
also... that will not work if you are testing boolean values.. since
>> false.blank?
=> true
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mongodb, replicates and error: { “$err” : “not master and slaveOk=false”, “code” : 13435 }
...yPreferred
http://mongodb.github.io/node-mongodb-native/3.6/api/Collection.html (search readPreference)
const { MongoClient, ReadPreference } = require('mongodb');
const client = await MongoClient.connect(MONGODB_CONNECTIONSTRING, { readPreference: ReadPreference.PRIMARY_PREFERRED });
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django template display item value or empty string
My code in template is like this:
2 Answers
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Is it OK to leave a channel open?
... (never close the channel) if I never check for its state? Will it lead to memory leaks? Is the following code OK?
5 Answer...
Matplotlib scatter plot with different text at each data point
I am trying to make a scatter plot and annotate data points with different numbers from a list.
So, for example, I want to plot y vs x and annotate with corresponding numbers from n .
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