How to increment a 4 decimal place value in Javascript? [closed] - javascript

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How do you increment a currency fractional part?
For instance, let's say you have 14.0009 and you want to increment it to 14.0010 when press the up arrow key

If you are using a HTML5 Input number field then set the step attribute to step="0.0001".
See more: https://www.w3schools.com/tags/att_input_step.asp
See more: https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/step

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How many elements in this array [,,]? [closed]

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In Javascript,
can someone explain to me why
[,,] has 2 undefines elements and not three
[1,1,1] - has 3 elements so why [,,] has only two!
Actually it is from the definition in ES6, If you do not write anything after the last comma, then the item doesn't count for length.

Changing numeric value in constant variable [closed]

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How can I change the value of a constant variable? For example, I have the price on my site:
const PHONE_PRICE = 250;
but now I want to change it in this assignment without making changes elsewhere. Is it possible?
No. The purpose of a constant is precisely that it can't change. If you want it to change, make it a variable:
let PHONE_PRICE = 250;

I want to target an html attribute with JS and make it equal to 0. [closed]

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How to target an html attribute with JS by his id and make it equal to some number.
document.getElementById('foo').setAttribute('bar', 0);
Where foo is the ID of your element and bar is the name of the attribute you want to change.

How to get a character line from a website with Javascript [closed]

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What i want to do is to get a line of character from a website which has a token generator that generates every time it opens a new code and then put into my link.
Not sure if it's what you want :
var link = "mylink.com/"+result ;

how to detect an already set initial scale in a website using javascript? [closed]

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i want to change certain elements regarding their style by detecting the initial scale already used by the owner of the website.
Thanks
I found it my self,
var scale=Number((screen.width/window.innerWidth).toFixed(1));
scale has the required value!

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