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How to reverse a singly linked list using only two pointers?
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I'm not sure about 'obvious errors' in the original. Design-wise, not passing the head of the list in and not returning the new head is a bad idea. The only bug, though, is the last line in the reverse() function should be setting first, I believe. O...
What is the Java ?: operator called and what does it do?
...th branches must lead to methods with return values:
It is a compile-time error for either the second or the third operand expression to be an invocation of a void method.
In fact, by the grammar of expression statements (§14.8), it is not permitted for a conditional expression to appear in any co...
How to get base url with jquery or javascript?
...(then setting the url protocol to "http://" will present some really weird errors depending on how you want to use the url).
– Jason Rice
Nov 4 '19 at 23:39
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Using current time in UTC as default value in PostgreSQL
...WITHOUT TIME ZONE DEFAULT (NOW() AT TIME ZONE "UTC") NOT NULL; fails with: ERROR: column "UTC" does not exist. Make sure 'utc' is all lower-case.
– code_dredd
Nov 22 '19 at 1:00
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What is the !! (not not) operator in JavaScript?
...he HTML5 <audio> element, but we don't want the function to throw an error if <audio> is undefined; and we don't want to use try ... catch to handle any possible errors (because they're gross); and also we don't want to use a check inside the function that won't consistently reveal the t...
Subclassing a Java Builder class
...stead of extends, or (c) throw everything away. I now have a weird compile error where leafBuilder.leaf().leaf() and leafBuilder.mid().leaf() is OK, but leafBuilder.leaf().mid().leaf() fails...
– Ken Y-N
Jun 19 '13 at 4:01
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How do I measure execution time of a command on the Windows command line?
... FYI - I don't think timeit works on Windows 7 64-bit. You get the error "Unable to query system performance data (c0000004). Instead, use PowerShell's "Measure-Command" like Casey.K suggests: stackoverflow.com/questions/673523/…
– Michael La Voie
Oc...
Parsing a JSON string in Ruby
...ny cases you want to wrap JSON.parse within a rescue block for JSON::ParserError.
– johnml
Jun 10 '14 at 10:48
JSON.pa...
Convert JS Object to form data
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its keep append the json after several times of error debug
– Snow Bases
Jul 15 '19 at 21:04
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Rails 3 - can't install pg gem
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As stated in your error log you need to pass in the path to the pg_config. Try to install the gem using:
gem install pg -- --with-pg-config= 'PATH_TO_YOUR_PG_CONFIG'
If you are not sure where your pg_config is, and assuming you are on Linux...