I can’t remember the last time I actually needed to use an explicit cursor for looping in PL/pgSQL. Use the implicit cursor of a FOR loop, that’s much cleaner: DO $$ DECLARE rec record; nbrow bigint; BEGIN FOR rec IN SELECT * FROM pg_tables WHERE tablename NOT LIKE ‘pg\_%’ ORDER BY tablename LOOP EXECUTE ‘SELECT … Read more
To skip lines starting with #: grep -v ‘^#’ myfile | while read -r file ; do … done Modify the grep command as needed to, for example, skip lines starting with whitespace and a # character.
You’d have to write your own implementation of Iterable<Boolean> which took an array of bytes, and then created Iterator<Boolean> values which remembered the current index into the byte array and the current index within the current byte. Then a utility method like this would come in handy: private static Boolean isBitSet(byte b, int bit) { … Read more
You concrete problem is caused because you’re mixing discouraged and old school scriptlets <% %> with its successor EL ${}. They do not share the same variable scope. The allFestivals is not available in scriptlet scope and the i is not available in EL scope. You should install JSTL (<– click the link for instructions) … Read more
Starting Python 3.8, and the introduction of assignment expressions (PEP 572) (:= operator), it’s now possible to capture an expression value (here sys.stdin.read(1)) as a variable in order to use it within the body of while: while (i := sys.stdin.read(1)) != ‘\n’: do_smthg(i) This: Assigns sys.stdin.read(1) to a variable i Compares i to \n If … Read more
There are couple of locations where this could be specified, i.e. a couple of things that are considered “The Ruby Language Specification”: the ISO Ruby Language Specification the RubySpec project the YARV testsuite The Ruby Programming Language book by matz and David Flanagan The ISO spec doesn’t say anything about Hash ordering: it was written … Read more
$array = array(“Jonathan”,”Sampson”); foreach($array as $value) { print $value; } or $length = count($array); for ($i = 0; $i < $length; $i++) { print $array[$i]; }
The labels in JavaScript are used mainly with break, or continue in nested loops to be able to break the outer, or continue the outer loop from the code inside inner loop: outer: for (let i = 0; i < 10; i++) { let k = 5; for (let j = 0; j < 10; … Read more
I can, of course, only speculate. However when I run your test with the JIT compiler enabled vs disabled, I get the following results: % with JIT no JIT 0.1677 0.0011 %# init 0.0974 0.0936 %# #1 I added an assigment before this line to avoid issues with deferring 0.4005 0.4028 %# #2 0.4047 0.4005 … Read more
You can simplify things a bit by putting command right in the test and doing increments a bit differently. Otherwise the script looks fine: NEXT_WAIT_TIME=0 until [ $NEXT_WAIT_TIME -eq 5 ] || command; do sleep $(( NEXT_WAIT_TIME++ )) done [ $NEXT_WAIT_TIME -lt 5 ]