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JS: iterating over result of getElementsByClassName using Array.forEach
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Bear in mind the performance penalty over getElementByClassName
– Szabolcs Páll
Aug 30 '18 at 14:20
3
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Is a colon `:` safe for friendly-URL use?
...ery string in the request URL, while HTML constructs one when submitting a form with GET method. Whichever implemented in the real world wins at the end of the day.
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Memoization in Haskell?
...ter_f) [0..]
faster_f :: Int -> Int
faster_f n = f_list !! n
That performs passably well, and replaces what was going to take O(n^3) time with something that memoizes the intermediate results.
But it still takes linear time just to index to find the memoized answer for mf. This means that res...
How can I find the length of a number?
...This actually gives the "length" of the number even if it's in exponential form. num is supposed to be a non negative integer here: if it's negative, take its absolute value and adjust the sign afterwards.
Update for ES2015
Now that Math.log10 is a thing, you can simply write
const len = Math.cei...
How can I check if a var is a string in JavaScript?
... are Strings (typeof always returns a String), JavaScript is defined to perform the same steps had I used === (strict comparison operator).
As Box9 mentions, this won't detect a instantiated String object.
You can detect for that with....
var isString = str instanceof String;
jsFiddle.
...or....
Scala: Abstract types vs generics
... At least in principle, we can express every sort of parameterization as a form of object-oriented abstraction. So in a sense you could say Scala is a more orthogonal and complete language.
Why?
What, in particular, abstract types buy you is a nice treatment for these covariance problems we talked...
What is correct HTTP status code when redirecting to a login page?
...ause required authorization does not exist. Using 30x for this does not conform to HTTP.
How to Think About HTTP Status Codes by Mark Nottingham
401 Unauthorized triggers HTTP’s request authentication mechanism.
401 Unauthorized status code requires presence of WWW-Authenticate header that ...
Should I use encodeURI or encodeURIComponent for encoding URLs?
... said the webserver would do it, but whatever library you use to read your form data will take care of it for you.
– Quentin
Dec 27 '10 at 18:29
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Prevent browser from loading a drag-and-dropped file
...Listener } from '@angular/core';
//...
@Component({
template: `
<form>
<!-- ... -->
<input type="file" class="dropzone" />
</form>
`
})
export class MyComponentWithDropTarget {
//...
@HostListener('document:dragover', ['$event'])
@HostListener...
Why is a C++ Vector called a Vector?
...ts that are numbers. For example, certain sets of functions can be used to form vector spaces where the components are functions.
– jason
Sep 15 '09 at 20:56
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