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Key existence check in HashMap
...transactions of 100 and 200 to checking_account you can write:
HashMap<String, ArrayList<Integer>> map = new HashMap<>();
map.computeIfAbsent("checking_account", key -> new ArrayList<>())
.add(100)
.add(200);
This way you don't have to check to see if the key chec...
Reference assignment operator in PHP, =&
...ion 6.2:
All binary arithmetic, comparison, assignment, bitwise, logical, string, and type operators MUST be preceded and followed by at least one space
By this rule, there should always be a space after the = operator -- this makes =& a violation.
Furthermore, there are other rules that state...
Loop through a date range with JavaScript
...by default. Calling Date without the new constructor just gives you a Date string which you then convert to a Date object anyway?
– tatlar
Sep 10 '14 at 17:52
...
Cron and virtualenv
...e /path/to/virtualenv/bin/activate && /path/to/build/manage.py some_command > /dev/null
It's tricky to spot why this fails as /var/log/syslog doesn't log the error details. Best to alias yourself to root so you get emailed with any cron errors. Simply add yourself to /etc/aliases and ...
How to enable CORS in AngularJs
...on
public class SupplierServicesApplication {
public static void main(String[] args) {
SpringApplication.run(SupplierServicesApplication.class, args);
}
@Bean
public WebMvcConfigurer corsConfigurer() {
return new WebMvcConfigurerAdapter() {
@Override
...
how does Array.prototype.slice.call() work?
... sadly you can't convert just any object this way, if your object keys are string values, like in actual words.. This will fail, so keep your objects content as '0':'value' and not like 'stringName':'value'.
– joopmicroop
Apr 9 '13 at 14:45
...
MySQL Like multiple values
...
if you are passing in an unknown amount of keywords as a string (a|b|c...), the regexp is the only way to go if you want to do LIKE, is it?
– frequent
Jun 21 '12 at 12:53
...
Detecting design mode from a Control's constructor
...sInDesignMode()
{
if (Application.ExecutablePath.IndexOf("devenv.exe", StringComparison.OrdinalIgnoreCase) > -1)
{
return true;
}
return false;
}
You can also do it by checking process name:
if (System.Diagnostics.Process.GetCurrentProcess().ProcessName == "devenv")
...
Listing each branch and its last revision's date in Git
... for showing how to use it with .gitconfig! Also fwiw I changed the format string to: --format='%(authordate)%09%(objectname:short)%09%(refname)' which gets the short hash of each branch as well.
– Noah Sussman
Apr 4 '13 at 14:15
...
CSS Input Type Selectors - Possible to have an “or” or “not” syntax?
...ul>
Multiple selectors
As Vincent mentioned, it's possible to string multiple :not()s together:
input:not([type='checkbox']):not([type='submit'])
CSS4, which is not yet widely supported, allows multiple selectors in a :not()
input:not([type='checkbox'],[type='submit'])
Legacy s...