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How to print a number with commas as thousands separators in JavaScript
...trying to print an integer in JavaScript with commas as thousands separators. For example, I want to show the number 1234567 as "1,234,567". How would I go about doing this?
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When to use symbols instead of strings in Ruby?
...rule of thumb is to use symbols every time you need internal identifiers. For Ruby < 2.2 only use symbols when they aren't generated dynamically, to avoid memory leaks.
Full answer
The only reason not to use them for identifiers that are generated dynamically is because of memory concerns.
Thi...
How to check if a value exists in a dictionary (python)
...on is that each of the above returns a different type of object, which may or may not be well suited for lookup operations:
>>> type(d.viewvalues())
<type 'dict_values'>
>>> type(d.values())
<type 'list'>
>>> type(d.itervalues())
<type 'dictionary-valueiter...
Large, persistent DataFrame in pandas
I am exploring switching to python and pandas as a long-time SAS user.
6 Answers
6
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Type safety: Unchecked cast
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Well, first of all, you're wasting memory with the new HashMap creation call. Your second line completely disregards the reference to this created hashmap, making it then available to the garbage collector. So, don't do that, use:
private Map<String, String&g...
How do you specify command line arguments in Xcode 4?
...since it just went gold master. I need to specify a command line argument for testing my application.
2 Answers
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What's the optimum way of storing an NSDate in NSUserDefaults?
There's two ways of storing an NSDate in NSUserDefaults that I've come across.
4 Answers
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Git status shows files as changed even though contents are the same
...eone else and am trying to commit the unstaged changes to the local repository. However, a lot (if not every) file appears as modified even though the contents are exactly the same.
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Border around tr element doesn't show?
It seems like Chrome/Firefox do not render borders on tr , but it renders the border if the selector is table tr td .
1 A...
Difference between Java SE/EE/ME?
...with some basics, so I will write simple programs that create files, directories, edit XML files and so on, nothing too complex for now.
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