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Any reason not to use '+' to concatenate two strings?
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122
There is nothing wrong in concatenating two strings with +. Indeed it's easier to read than ''...
Javascript: formatting a rounded number to N decimals
...number, something like:
var s = number.toString();
if (s.indexOf('.') == -1) s += '.';
while (s.length < s.indexOf('.') + 4) s += '0';
(Note that this assumes that the regional settings of the client uses period as decimal separator, the code needs some more work to function for other settings...
Grep characters before and after match?
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187
3 characters before and 4 characters after
$> echo "some123_string_and_another" | grep -o ...
Scala Doubles, and Precision
...e or round a Double? At one point in my code I would like a number like: 1.23456789 to be rounded to 1.23
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How to sort a collection by date in MongoDB?
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Safely limiting Ansible playbooks to a single machine?
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How to convert an array of strings to an array of floats in numpy?
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181
Well, if you're reading the data in as a list, just do np.array(map(float, list_of_strings)) (...
How to 'insert if not exists' in MySQL?
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Apache Spark: The number of cores vs. the number of executors
... Imagine a cluster with six nodes running NodeManagers, each
equipped with 16 cores and 64GB of memory. The NodeManager capacities,
yarn.nodemanager.resource.memory-mb and
yarn.nodemanager.resource.cpu-vcores, should probably be set to 63 *
1024 = 64512 (megabytes) and 15 respectively. We avoid allo...