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Appending a line to a file only if it does not already exist
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Beautiful solution. This also works for triggering more complicated expressions, of course. Mine uses the echo to trigger a cat of a multiline heredoc into a config file.
– Eric L.
Jun 15 '15 at 16:10
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Git error when trying to push — pre-receive hook declined
...like you've got a problem with your setup on the server-side. Please share more information then.
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“INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE”
... ANSI SQL 2003 defines a MERGE statement that can solve the same need (and more), but MySQL does not support the MERGE statement.
A user tried to edit this post (the edit was rejected by moderators). The edit tried to add a claim that INSERT...ON DUPLICATE KEY UPDATE causes a new auto-increment ...
What is Weak Head Normal Form?
...mory stats with :set +s. You can then see that foldl' f ends up allocating more thunks than foldl' f'.
– hammar
Jun 2 '17 at 15:34
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Adjust UILabel height depending on the text
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How do I convert dates in a Pandas data frame to a 'date' data type?
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What is the JavaScript >>> operator and how do you use it?
...sts against using such things). It doesn't mean that its wrong to do, but more favorable and familiar methods exist to make code more readable. A more clear way to ensure that len is 0 is either of the following two methods.
// Cast this.length to a number
var len = +this.length;
or
// Cast thi...
pyplot scatter plot marker size
...uare of width, doubling the width actually appears to increase the size by more than a factor 2 (in fact it increases it by a factor of 4). To see this consider the following two examples and the output they produce.
# doubling the width of markers
x = [0,2,4,6,8,10]
y = [0]*len(x)
s = [20*4**n for...
jQuery event handlers always execute in order they were bound - any way around this? [duplicate]
...hich these items were attached can soon get out of hand as you keep adding more and more of these ordered events.
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