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Running Bash commands in Python
...thing else, as trivially exemplified by the enhancement that we can easily include the host name along with the shell command output. (This is by no means challenging to do in the shell, either, but at the expense of yet another diversion and perhaps another process.)
Common Shell Constructs
For c...
Best practices: throwing exceptions from properties
...s perfectly normal to throw ObjectDisposedException from any class member, including property getters (and excluding Dispose itself), after the object has been disposed.
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JavaScript unit test tools for TDD
...atures, as reported by its website:
browser support
simple async support, including promises
test coverage reporting
string diff support
javascript # API for running tests
proper exit status for CI support etc
auto-detects and disables coloring for non-ttys
maps uncaught exceptions to the correct t...
How does the Amazon Recommendation feature work?
...a subset of the field of data mining. Typical components in such a system include identification of primary driver items and the identification of affinity items (accessory upsell, cross sell).
Keep in mind the data sources they have to mine...
Purchased shopping carts = real money from re...
Constructor function vs Factory functions
...nction) should be consistent. The example for the factory function doesn't include someMethod for the objects returned by the factory, and that's where it gets a bit foggy. Inside the factory function, if one just does var obj = { ... , someMethod: function() {}, ... }, that would lead to each objec...
Set cursor position on contentEditable
...tuitative as normally you expect the cursor to go where you click but code included for completeness)
To achieve this the onclick and onmousedown events are canceled by the function cancelEvent() which is a cross browser function to cancel the event. The cancelEvent() function also runs the restore...
Are the decimal places in a CSS width respected?
...ayout systems where parents widths are ems, and children are percents, and including up to four decimal points upstream had a noticeable impact.
Edge case, sure, but something to keep in mind.
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Make git automatically remove trailing whitespace before committing
...cally"
I believe the git hook pre-commit would do a better job for that (includes removing trailing whitespace)
Note that at any given time you can choose to not run the pre-commit hook:
temporarily: git commit --no-verify .
permanently: cd .git/hooks/ ; chmod -x pre-commit
Warning: by def...
What does “coalgebra” mean in the context of programming?
...n mappend ∷ (τ, τ) → τ and an identity mzero ∷ τ. Other examples include things like groups (which are just like monoids except with an extra invert ∷ τ → τ function), rings, lattices and so on.
All the functions operate on τ but can have different arities. We can write these out a...
Convert .pem to .crt and .key
... the key...
openssl rsa -in foo.pem -out foo.key
Extract all the certs, including the CA Chain
openssl crl2pkcs7 -nocrl -certfile foo.pem | openssl pkcs7 -print_certs -out foo.cert
Extract the textually first cert as DER
openssl x509 -in foo.pem -outform DER -out first-cert.der
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