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What does “Splats” mean in the CoffeeScript tutorial?
...t, rest..., last) ->
In the first two cases, if the function receives 0-1 arguments, rest will be an empty array. In the last case, the function needs to receive more than 2 arguments for rest to be non-empty.
Since JavaScript doesn't allow multiple signatures for functions with the same name ...
Select rows which are not present in other table
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+500
There are basically 4 techniques for this task, all of them standard SQL.
NOT EXISTS
Often fastest in Postgres.
SELECT ip
FROM ...
Which is the first integer that an IEEE 754 float is incapable of representing exactly?
...ed and will be rounded is:
For float, 16,777,217 (224 + 1).
For double, 9,007,199,254,740,993 (253 + 1).
>>> 9007199254740993.0
9007199254740992
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Alter Table Add Column Syntax
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edited Apr 27 '09 at 17:02
Eoin Campbell
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Read and overwrite a file in Python
...ilename, 'r+')
text = f.read()
text = re.sub('foobar', 'bar', text)
f.seek(0)
f.write(text)
f.truncate()
f.close()
The functionality will likely also be cleaner and safer using open as a context manager, which will close the file handler, even if an error occurs!
with open(filename, 'r+') as f:
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What is the use for Task.FromResult in C#
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answered Oct 31 '13 at 0:40
Stephen ClearyStephen Cleary
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DbArithmeticExpression arguments must have a numeric common type
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edited Dec 14 '17 at 11:03
community wiki
7 r...
What is android:weightSum in android, and how does it work?
...tent"
android:layout_weight="1"
android:layout_width="0dp"/>
.....
weightSum is useful for having the layout rendered correctly for any device, which will not happen if you set width and height directly.
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How to count certain elements in array?
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Very simple:
var count = 0;
for(var i = 0; i < array.length; ++i){
if(array[i] == 2)
count++;
}
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Difference between .tagName and .nodeName
What is the difference between $('this')[0].nodeName and $('this')[0].tagName ?
4 Answers
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