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Regex for numbers only
...e there's a way to change this behavior, but as I said, I've never really done much with regular expressions.
17 Answers
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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 most efficient/elegant way to parse a flat table into a tree?
...tore all paths in the Closure Table, where there is a direct ancestry from one node to another. Include a row for each node to reference itself. For example, using the data set you showed in your question:
INSERT INTO ClosureTable (ancestor_id, descendant_id) VALUES
(1,1), (1,2), (1,4), (1,6),
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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...
How can I use pointers in Java?
...eard that Java programs can be created with pointers and that this can be done by the few who are experts in java. Is it true?
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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...
Reopen last closed tab in Visual Studio
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@bugybunny You can try this one: marketplace.visualstudio.com/… it should also work with VS2017.
– Adam Wulkiewicz
Jun 30 at 2:31
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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...
@Resource vs @Autowired
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In spring pre-3.0 it doesn't matter which one.
In spring 3.0 there's support for the standard (JSR-330) annotation @javax.inject.Inject - use it, with a combination of @Qualifier. Note that spring now also supports the @javax.inject.Qualifier meta-annotation:
@Qual...