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How to create a string with format?
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I think this could help you:
let timeNow = time(nil)
let aStr = String(format: "%@%x", "timeNow in hex: ", timeNow)
print(aStr)
Example result:
timeNow in hex: 5cdc9c8d
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ActiveRecord: List columns in table from console
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This will list the column_names from a table
Model.column_names
e.g. User.column_names
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How should one use std::optional?
I'm reading the documentation of std::experimental::optional and I have a good idea about what it does, but I don't understand when I should use it or how I should use it. The site doesn't contain any examples as of yet which leaves it harder for me to grasp the true concept of this object. When...
JavaScript: Upload file
Let's say I have this element on the page:
2 Answers
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I need to generate uuid for my rails application. What are the options(gems) I have? [duplicate]
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There are plenty of options, I recommend not to add additional dependencies and use SecureRandom which is builtin:
SecureRandom.uuid #=> "1ca71cd6-08c4-4855-9381-2f41aeffe59c"
See other possible formats here.
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ALTER TABLE to add a composite primary key
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thanks for posting -- really got me out of battling with the ui
– plditallo
Aug 31 '13 at 3:41
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Difference between margin and padding?
...ding in CSS? It really doesn't seem to serve much purpose. Could you give me an example of where the differences lie (and why it is important to know the difference)?
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How can I convert my device token (NSData) into an NSString?
I am implementing push notifications. I'd like to save my APNS Token as a String.
29 Answers
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In php, is 0 treated as empty?
...ared, but without a value in a class)
Note that this is exactly the same list as for a coercion to Boolean false. empty is simply !isset($var) || !$var. Try isset instead.
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How would Git handle a SHA-1 collision on a blob?
...a commit, and get very very unlucky: one of the blobs ends up having the same SHA-1 as another that is already in your repository. Question is, how would Git handle this? Simply fail? Find a way to link the two blobs and check which one is needed according to the context?
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