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How to deal with “java.lang.OutOfMemoryError: Java heap space” error?
... the Java class that has a runnable main (that is "public static void main(String[] args)"), then choose Run As - Run Configuration. Then "Arguments" is the tab right after the Main (you see the tabs Main, Arguments, JRE, Classpath, Source, Environment, Common).
– CuongHuyTo
...
What is the difference between build.sbt and build.scala?
...thand notation roughly equivalent to this project/Build.scala:
import sbt._
import Keys._
object Build extends Build {
lazy val root = Project(id = "root", base = file(".")).settings(
name := "hello",
version := "1.0"
)
}
The .sbt file can also include vals, lazy vals, and defs...
Is null check needed before calling instanceof?
...yself.
public class IsInstanceOfTest {
public static void main(final String[] args) {
String s;
s = "";
System.out.println((s instanceof String));
System.out.println(String.class.isInstance(s));
s = null;
System.out.println((s instanceof Str...
Python regex find all overlapping matches?
...ou're interested in, but the actual match is technically the zero-width substring before the lookahead, so the matches are technically non-overlapping:
import re
s = "123456789123456789"
matches = re.finditer(r'(?=(\d{10}))',s)
results = [int(match.group(1)) for match in matches]
# results:
# [12...
Type converting slices of interfaces
...l rule that syntax should not hide complex/costly operations. Converting a string to an interface{} is done in O(1) time. Converting a []string to an interface{} is also done in O(1) time since a slice is still one value. However, converting a []string to an []interface{} is O(n) time because each e...
Warn user before leaving web page with unsaved changes
...ou can do this by handling the beforeunload event and returning a non-null string:
window.addEventListener("beforeunload", function (e) {
var confirmationMessage = 'It looks like you have been editing something. '
+ 'If you leave before saving, your changes will be l...
iPhone : How to detect the end of slider drag?
...*)slider forEvent:(UIEvent*)event {
UITouch *touchEvent = [[event allTouches] anyObject];
switch (touchEvent.phase) {
case UITouchPhaseBegan:
// handle drag began
break;
case UITouchPhaseMoved:
// handle drag moved
bre...
How to dump a table to console?
... It returns a function that transforms any Lua value into a human-readable string:
local inspect = require('inspect')
print(inspect({1,2,3})) -- {1, 2, 3}
print(inspect({a=1,b=2})
-- {
-- a = 1
-- b = 2
-- }
It indents subtables properly, and handles "recursive tables" (tables that contain r...
string.ToLower() and string.ToLowerInvariant()
...oducing ınfo without the dot on the i instead of info and thus mucking up string comparisons. For that reason, ToLowerInvariant should be used on any non-language-specific data. When you might have user input that might be in their native language/character-set, would generally be the only time y...
How to add folder to assembly search path at runtime in .NET?
...ic Assembly LoadFromSameFolder(object sender, ResolveEventArgs args)
{
string folderPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
string assemblyPath = Path.Combine(folderPath, new AssemblyName(args.Name).Name + ".dll");
if (!File.Exists(assemblyPath)) return nu...