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Switching between GCC and Clang/LLVM using CMake
...between using GCC or Clang/LLVM to compile them. I believe (please correct me if I'm mistaken!) that to use Clang I need to set the following:
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How to access the last value in a vector?
Suppose I have a vector that is nested in a dataframe one or two levels. Is there a quick and dirty way to access the last value, without using the length() function? Something ala PERL's $# special var?
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How to efficiently count the number of keys/properties of an object in JavaScript?
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To do this in any ES5-compatible environment, such as Node, Chrome, IE 9+, Firefox 4+, or Safari 5+:
Object.keys(obj).length
Browser compatibility
Object.keys documentation (includes a method you can add to non-ES5 browsers)
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How do I show a MySQL warning that just happened?
I just ran a simple MySQL CREATE TABLE statement that produced the line
3 Answers
3
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Is That REST API Really RPC? Roy Fielding Seems to Think So
...ecessary because the information is a bit scattered. The actual question comes at the end if you're already familiar with this topic.
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How is Python's List Implemented?
...It's a dynamic array. Practical proof: Indexing takes (of course with extremely small differences (0.0013 µsecs!)) the same time regardless of index:
...>python -m timeit --setup="x = [None]*1000" "x[500]"
10000000 loops, best of 3: 0.0579 usec per loop
...>python -m timeit --setup="x = [No...
How to pass arguments into a Rake task with environment in Rails? [duplicate]
I am able to pass in arguments as follows:
5 Answers
5
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Sending command line arguments to npm script
... server.js --port=1337 => npm run server -- --port=1337
To get the parameter value, see this question. For reading named parameters, it's probably best to use a parsing library like yargs or minimist; nodejs exposes process.argv globally, containing command line parameter values, but this is a l...
pandas GroupBy columns with NaN (missing) values
I have a DataFrame with many missing values in columns which I wish to groupby:
9 Answers
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Capture characters from standard input without waiting for enter to be pressed
I can never remember how I do this because it comes up so infrequently for me. But in C or C++, what is the best way to read a character from standard input without waiting for a newline (press enter).
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