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What do all of Scala's symbolic operators mean?

Scala syntax has a lot of symbols. Since these kinds of names are difficult to find using search engines, a comprehensive list of them would be helpful. ...
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Officially, what is typename for?

...trange compile errors that magically went away by prefixing the typename keyword to the beginning of the declaration... (For example, just last week, I was declaring two iterators as members of another templated class and I had to do this)... ...
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How can I count the occurrences of a list item?

... user2357112 supports Monica 200k2020 gold badges287287 silver badges373373 bronze badges answered Apr 8 '10 at 13:31 ŁukaszŁukasz ...
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npm WARN package.json: No repository field

... It's just a check as of NPM v1.2.20, they report this as a warning. However, don't worry, there are sooooooo many packages which still don't have the repository field in their package.json. The field is used for informational purposes. In...
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how to change default python version?

... This is probably desirable for backwards compatibility. Python3 breaks backwards compatibility, and programs invoking 'python' probably expect python2. You probably have many programs and scripts which you are not even aware of which expect python=python2, a...
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Asynchronous vs Multithreading - Is there a difference?

...ered Mar 1 '09 at 23:23 Michael KohneMichael Kohne 11.4k22 gold badges4343 silver badges6868 bronze badges ...
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New to MongoDB Can not run command mongo

... I think your log output states it clearly; exception in initAndListen: 10296 dbpath (/data/db) does not exist, terminating You may simply create this directory or better to define it as a configuration value within your configur...
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Elegant way to check for missing packages and install them?

...novice/intermediate R users and don't realize that they have to install packages they don't already have. 29 Answers ...
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How do I update each dependency in package.json to the latest version?

I copied package.json from another project and now want to bump all of the dependencies to their latest versions since this is a fresh project and I don't mind fixing something if it breaks. ...
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jQuery Validate Plugin - Trigger validation of single field

I've got a form that can optionally be pre-populated via facebook connect. Once a user connects, their name and email are automatically filled in. The problem is that this doesn't trigger the remote validation to check if the email already exists. ...