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When to use lambda, when to use Proc.new?
...om :0
irb(main):006:0> p.call "hello"
TypeError: can't convert nil into String
from (irb):2:in `+'
from (irb):2
from (irb):6:in `call'
from (irb):6
from :0
The page also recommends using lambda unless you specifically want the error tolerant behavior. I agree with this senti...
Converting a Java collection into a Scala collection
...port scala.collection.JavaConversions._
val list = new java.util.ArrayList[String]()
list.add("test")
val set = list.toSet
set is a scala.collection.immutable.Set[String] after this.
Also see Ben James' answer for a more explicit way (using JavaConverters), which seems to be recommended now.
...
Declaring abstract method in TypeScript
... officially live.
abstract class Animal {
constructor(protected name: string) { }
abstract makeSound(input : string) : string;
move(meters) {
alert(this.name + " moved " + meters + "m.");
}
}
class Snake extends Animal {
constructor(name: string) { super(name); }
...
“PKIX path building failed” and “unable to find valid certification path to requested target”
... certificates.
*/
public class InstallCert {
public static void main(String[] args) throws Exception {
String host;
int port;
char[] passphrase;
if ((args.length == 1) || (args.length == 2)) {
String[] c = args[0].split(":");
host = c[0];...
how to get GET and POST variables with JQuery?
...actually empty, you will get a javascript syntax error. If you know it's a string, you should wrap it in quotes. If it's an integer, you may want to test to see if it actually exists before writing the line to javascript.
sh...
Is there a Python equivalent of the C# null-coalescing operator?
...
The number 0, None, and empty containers (including strings) are considered false, in addition to the constant False. Most everything else is considered true. I would say that the main danger here would be that you would get a true but non-string value, but that won't be an is...
Initial bytes incorrect after Java AES/CBC decryption
...e.commons.codec.binary.Base64;
public class Encryptor {
public static String encrypt(String key, String initVector, String value) {
try {
IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
SecretKeySpec skeySpec = new SecretKeySpec(key.getByt...
Rails raw SQL example
...
@AkshayGoyal you can use normal ruby string interpolation within the block. SELECT * FROM users WHERE users.id = #{ user.id }
– Nathan Beck
Nov 15 '19 at 18:21
...
Check if PHP session has already started
...
An example for testing if session_id() returns empty string in an include file:
– tgoneil
Oct 5 '12 at 8:05
3
...
Difference between CR LF, LF and CR line break types?
...always sent with the CR
first. In fact, it was often necessary
to send extra characters (extraneous
CRs or NULs, which are ignored) to
give the print head time to move to
the left margin. Even after teletypes
were replaced by computer terminals
with higher baud rates, many operating
...