Mischa

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Level 2
5,730 XP
May
04
1 week ago
Activity icon

Replied to JavaScript Conditional(?) Constant Declaration

Thank you!

Also I found that the piece of code in question – which is a borrowed part of a universal function I did to get various status of a given dom element in relation to the viewport (in short, inview base function) – actually can be written like so to make it more .. readable... :

const r = ( i === window || void 0 == i) ? window.pageYOffset : i.scrollTop

With these simple parentheses even I understand the condition (ternary operator) :-)

Activity icon

Replied to JavaScript Conditional(?) Constant Declaration

Thank you sr57:-)

So you mean when I call H() with one parameter only, i = window, otherwise i gets set to the second parameters value ?

May
03
1 week ago
Activity icon

Started a new Conversation JavaScript Conditional(?) Constant Declaration

Hi all,

Simple question for all the JavaScript cracks out there, I think:

In

function H(t=0, e=t) {
	    return function(n, i=window) {
	        const r = i === window || void 0 == i ? window.pageYOffset : i.scrollTop

what does

const r = i === window || void 0 == i ? window.pageYOffset : i.scrollTop

actually do?

Does it set r and i to the window.pageYOffse if window is defined or i is null? and else it sets these to i.scrollTop which makes no sense to me since i seems to be defined as window.

Thank you if you can spare a few minutes to enlighten me :-)