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JavaScript isset() equivalent
...) => some) // false
// Defining objects
let some = { nested: { value: 'hello' } }
// More tests that never throw an error
isset(() => some) // true
isset(() => some.nested) // true
isset(() => some.nested.value) // true
isset(() => some.nested.deeper.value) // false
// Less compact...
Remove whitespaces inside a string in javascript
...
For space-character removal use
"hello world".replace(/\s/g, "");
for all white space use the suggestion by Rocket in the comments below!
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Shorthand way for assigning a single field in a record, while copying the rest of the fields?
...nt, c :: String } -- define a Foo
> let foo = Foo { a = 1, b = 2, c = "Hello" } -- create a Foo
> let updateFoo x = x { c = "Goodbye" } -- function to update Foos
> updateFoo foo -- update the Foo
Foo {a = 1, b = 2, c = "Goodbye" ...
What is output buffering?
...ing content.
Consider this example:
<?php
ob_start( );
echo "Hello World";
if ( $some_error )
{
header( "Location: error.php" );
exit( 0 );
}
?>
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Remove empty elements from an array in Javascript
...(function(e){ return e.replace(/(\r\n|\n|\r)/gm,"")});
Example:
arr = ["hello",0,"",null,undefined,1,100," "]
arr.filter(function(e){return e});
Return:
["hello", 1, 100, " "]
UPDATE (based on Alnitak's comment)
In some situations you may want to keep "0" in the array and remove anything ...
Scala: Nil vs List()
...ary as an accumulator value for foldLeft? Example - scala> Map(1 -> "hello", 2 -> "world").foldLeft(List[String]())( (acc, el) => acc :+ el._2) res1: List[String] = List(hello, world) Using Nil as the accumulator here wouldn't work.
– Kevin Meredith
...
How can I troubleshoot my Perl CGI script?
...est.pl
use 5.10.1;
use warnings;
use strict;
my $b = '1';
my $a = sub { "hello $b there" };
$b = '2';
print "YEAH " . $a->() . " CMON\n";
$b = '3';
print "CMON " . &$a . " YEAH\n";
$DB::single=1; # BREAKPOINT
$b = '4';
print "STEP " . &$a . " NOW\n";
$b = '5';
print "STEP " . &$a...
Batch file: Find if substring is in string (not in a file)
... bcd
endlocal
And the results of various runs:
c:\testarea> testprog hello
c:\testarea> testprog abcdef
It contains bcd
c:\testarea> testprog bcd
It contains bcd
A couple of notes:
The if statement is the meat of this solution, everything else is support stuff.
The x before the two...
How does the const constructor actually work?
...nst Foo(1, 3); // $Foo$int$1$int$3
var baz1 = const Baz(const Foo(1, 1), "hello"); // $Baz$Foo$int$1$int$1$String$hello
var baz2 = const Baz(const Foo(1, 1), "hello"); // $Baz$Foo$int$1$int$1$String$hello
Constants are not recreated each time. They are canonicalized at compile time and stored in ...
How to declare Return Types for Functions in TypeScript
... this.greeting = message;
}
greet() : string {
return "Hello, " + this.greeting;
}
}
var greeter = new Greeter("Hi");
var result = greeter.greet();
Here is the number example - you'll see red squiggles in the playground editor if you try this:
greet() : number {
retu...