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Ruby on Rails: How do I add placeholder text to a f.text_field?
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271
With rails >= 3.0, you can simply use the placeholder option.
f.text_field :attr, placeholde...
Revert to a commit by a SHA hash in Git? [duplicate]
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1167
If you want to commit on top of the current HEAD with the exact state at a different commit, ...
Simple explanation of MapReduce?
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189
Going all the way down to the basics for Map and Reduce.
Map is a function which "transform...
Filter dataframe rows if value in column is in a set list of values [duplicate]
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Harvey
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answered Aug 22 '12 at 3:21
BrenBarnBrenBarn
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How to check if a value exists in a dictionary (python)
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>>> d = {'1': 'one', '3': 'three', '2': 'two', '5': 'five', '4': 'four'}
>>> 'one' in d.values()
True
Out of curiosity, some comparative timing:
>>> T(lambda : 'one' in d.itervalues()).repeat()
[0.28107285499572754...
Adding two Java 8 streams, or an extra element to a stream
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126
If you add static imports for Stream.concat and Stream.of, the first example could be written ...
Java: splitting a comma-separated string but ignoring commas in quotes
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11 Answers
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Force point (“.”) as decimal separator in java
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174
Use the overload of String.format which lets you specify the locale:
return String.format(Loc...
How to move an element into another element?
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15 Answers
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