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How to set child process' environment variable in Makefile
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I have GNU make 3.81, and all: <\n\t>export PROJ_ROOT=$(CURDIR)<\n\t>echo $(PROJ_ROOT)<\n> outputs the correct expansion for the first row, but only echo for the second one. PROJ_ROOT is not set after running make. Spaces around ...
How to put a label on an issue in GitHub if you are not a contributor / owner?
I've submitted an issue for a project on GitHub which is not mine and I'm not a contributor, but I cannot find a way to label my issue. Is there a way for me to label it, or is this only available for contributors?
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How to get all child inputs of a div element (jQuery)
... like `:checkbox' is, see here for details: api.jquery.com/input-selector And here's a more complete list of these: api.jquery.com/category/selectors/form-selectors
– Nick Craver♦
Mar 8 '10 at 16:18
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What is the difference between square brackets and parentheses in a regex?
.../^[789]\d{9}$/
/^[7-9]\d{9}$/
The explanation:
(a|b|c) is a regex "OR" and means "a or b or c", although the presence of brackets, necessary for the OR, also captures the digit. To be strictly equivalent, you would code (?:7|8|9) to make it a non capturing group.
[abc] is a "character class" th...
Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
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I had to change it for a bunch of columns and this doesn't require specifying the column type for each column, much better!
– Dorian
Jan 8 '15 at 12:19
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instantiate a class from a variable in PHP?
... sort of thing you'll see wrapped up in a Factory pattern.
See Namespaces and dynamic language features for further details.
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Heroku Postgres - terminate hung query (idle in transaction)
I'm using Heroku with the Crane Postgres option and I was running a query on the database from my local machine when my local machine crashed. If I run
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SQL query to get all values a enum can have
... a column name of "myenum". You might also want to cast the enum to text and specify a column name by adding something like. ::text AS my_column
– Justin Ohms
Aug 29 '13 at 3:25
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Declare a constant array
...hey are created at compile time, even when defined as locals in functions, and can only be numbers, characters (runes), strings or booleans. Because of the compile-time restriction, the expressions that define them must be constant expressions, evaluatable by the compiler. For instance, 1<<3 i...
What is the difference between assert, expect and should in Chai?
What is the difference between assert , expect and should , and when to use what?
2 Answers
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