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Using do block vs braces {}
...s of code:
1.upto 3 do |x|
puts x
end
1.upto 3 { |x| puts x }
# SyntaxError: compile error
Second example only works when parentheses is used, 1.upto(3) { |x| puts x }
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What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
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There is another case: ${var:?}, which will provide error when variable is unset or not set. REF: github.com/koalaman/shellcheck/wiki/SC2154
– Nam Nguyen
Apr 7 '15 at 4:32
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How do I analyze a program's core dump file with GDB when it has command-line parameters?
...t the way to use the core file. This could also be the reason you got that error. You can use the core file in the following ways:
gdb <executable> <core-file> or gdb <executable> -c <core-file> or
gdb <executable>
...
(gdb) core <core-file>
When using the cor...
In git, is there a way to show untracked stashed files without applying the stash?
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Note that you get an ugly error (fatal: ambiguous argument 'stash@{0}^3': unknown revision or path not in the working tree.) if you don't actually have untracked files in that stash (but thought you did).
– Randall
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What's the difference between IEquatable and just overriding Object.Equals()?
...bj is not of type EntityBase, it will pass "null" and continue without any error or exception, But in case of "(EntityBase)obj", it will forcefully try to cast the obj to EntityBase and if the obj is not of type EntityBase, it will throw InvalidCastException. And yes, "as" can only be applied to ref...
Entity Framework DateTime and UTC
...hnson without @Saustrup's using statements, you get some unhelpful compile errors such as 'System.Array' does not contain a definition for 'Where'
– Jacob Eggers
May 30 '14 at 19:24
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Why is String immutable in Java?
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The DZone article contains major errors about the operation of the Strign pool. It is only for constants. Ergo the stated rationale is invalid.
– Marquis of Lorne
Feb 13 '19 at 9:51
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Java: difference between strong/soft/weak/phantom reference
...ists GC cycle until no memory is available and there is risk of OutOfMemoryError (in that case, it can be removed).
On the other hand, a phantom Reference Object is useful only to know exactly when an object has been effectively removed from memory: normally they are used to fix weird finalize() r...
PostgreSQL: Is it better to use multiple databases with one schema each, or one database with multip
...e with more than 3000 schemas and pg_dump just fails with an out of memory error if you try to dump a single schema. I wonder if this would be any different had I 3000 databases instead.
– Machisuji
Feb 6 '17 at 13:41
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Defining custom attrs
...-auto"
Otherwise the application that uses the library will have runtime errors.
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