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How to delete or add column in SQLITE?
...d or remove constraints from a table.
You can:
create new table as the one you are trying to change,
copy all data,
drop old table,
rename the new one.
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NPM modules won't install globally without sudo
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One small detail to add is that you have to make the ~/npm directory yourself. Else, npm will exit with a ENOENT errors.
– Jason Farnsworth
Oct 3 '14 at 21:56
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What is the best way to compare floats for almost-equality in Python?
... Not to diminish the value of this answer (I think it's a good one), it's worth noting that the documentation also says: "Modulo error checking, etc, the function will return the result of..." In other words, the isclose function (above) is not a complete implementation.
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The static keyword and its various uses in C++
The keyword static is one which has several meanings in C++ that I find very confusing and I can never bend my mind around how its actually supposed to work.
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Makefiles with source files in different directories
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If you have code in one subdirectory dependent on code in another subdirectory, you are probably better off with a single makefile at top-level.
See Recursive Make Considered Harmful for the full rationale, but basically you want make to have t...
Remove Object from Array using JavaScript
...(someArray.slice(-x));
Reply to the comment of @chill182: you can remove one or more elements from an array using Array.filter, or Array.splice combined with Array.findIndex (see MDN), e.g.
// non destructive filter > noJohn = John removed, but someArray will not change
let someArray = ge...
JavaScript Regular Expression Email Validation [duplicate]
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this is the one i am using on my page.
http://www.zparacha.com/validate-email-address-using-javascript-regular-expression/
/^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,6}$/
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Converting a List to a comma separated string
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Clever but slow and bloated, as it allocates one string per element. Using a StringBuilder would be much more efficient.
– Steven Sudit
Oct 6 '09 at 23:49
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Tutorials and libraries for OpenGL-ES games on Android [closed]
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The site you mentioned is very good, but I think the best one I have found is by INsanityDesign. It is a port of the great OpenGL nehe tutorials. This is a great place to start, it gives you source at different levels that you can play with ...
How to keep environment variables when using sudo
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This did not work with the simpler case of adding one element to the PATH in the .bashrc file -- say, export PATH=myPath:$PATH. If I type sudo -E bash -c 'echo $PATH', then PATH does not contain myPath probably because sudo has already disabled the local value of PATH before...