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Time complexity of Sieve of Eratosthenes algorithm
... space complexity is O(n). Shouldn't that be theta of n because we need an array of n elements in any case?
– a_123
Mar 25 '16 at 21:35
...
How to append text to an existing file in Java?
...final Path path = Paths.get("path/to/filename.txt");
Files.write(path, Arrays.asList("New line to append"), StandardCharsets.UTF_8,
Files.exists(path) ? StandardOpenOption.APPEND : StandardOpenOption.CREATE);
} catch (final IOException ioe) {
// Add your own exception handling...
}
...
Pure JavaScript equivalent of jQuery's $.ready() - how to call a function when the page/DOM is ready
...we have, do nothing. If we haven't yet been called, then loop through the array of ready functions and call each one in the order they were added. Set a flag to indicate these have all been called so they are never executed more than once.
Clear the function array so any closures they might be usi...
Process all arguments except the first one (in a bash script)
... least bash 4) using set -- "${@:#}" where # is the starting number of the array element we want to preserve forward:
#!/bin/bash
someVar="${1}"
someOtherVar="${2}"
set -- "${@:3}"
input=${@}
[[ "${input[*],,}" == *"someword"* ]] && someNewVar="trigger"
echo -...
Why must wait() always be in synchronized block
...d of waiting for the monitor to enter it. Moreover, when e.g. accessing an array without a synchronized block, another thread may not see the changement to it...actually another thread will not see any changements to it when it already has a copy of the array in the x-level cache (a.k.a. 1st/2nd/3rd...
Predicate in Java
...rocess only the even numbers like this:
List<Integer> numbers = Arrays.asList(1,2,3,4,5,6,7,8,9,10);
for (int number : numbers) {
if (isEven(number)) {
process(number);
}
}
With Predicate, the if test is abstracted out as a type. This allows it to int...
Redis strings vs Redis hashes to represent JSON: efficiency?
...ong available options of storing json blob as an json string or as a byte array in Redis?
– Vinit89
Jul 11 '18 at 11:55
...
What is the difference between the template method and the strategy patterns?
... what exactly will be done on init, run and done.
Example of a strategy:
array.sort (IComparer<T> comparer)
Here, when writing a comparer, you do not inherit from an array. Array delegates the comparison algorithm to a comparer.
...
Efficient way to remove ALL whitespace from String?
...g RemoveWhitespace(this string input)
{
return new string(input.ToCharArray()
.Where(c => !Char.IsWhiteSpace(c))
.ToArray());
}
I tested it in a simple unit test:
[Test]
[TestCase("123 123 1adc \n 222", "1231231adc222")]
public void RemoveWhiteSpace1(string input, string ...
How can I store my users' passwords safely?
...ou need (for example by specifying a "cost" parameter through the $options array)
<?php
var_dump(password_hash("my-secret-password", PASSWORD_DEFAULT));
$options = array(
'cost' => 7, // this is the number of rounds for bcrypt
// 'salt' => 'TphfsM82o1uEKlfP9vf1f', // you could spe...