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Assign a value from getBoundingClientRect

I was trying this code from W3Schools and modified it to assign the resulted LEFT value to another element (DIV)
getBoundingClientRect example
Nothing happens even if the left value 8 is correctly recovered ! Any idea on how i am trying this assigning wrong !
Thanks

To directly assign CSS you need to pass a valid value more on MDN to it. So it needs to have e.g. "px" or "%" at it.
In short, it would work like that:
document.getElementById("aaa").style.left = x + "px";

You want to add: + "px"
Therefore change the following line:
document.getElementById("aaa").style.left = x;
to:
document.getElementById("aaa").style.left = x + "px";

javascript formatting css in a innerhtml

document.getElementById("days").innerHTML = document.getElementById("days").innerHTML + daynumber
dayname;
if(dayname.value==6 || dayname==0)
{
daynumber.style.boder("solid");
}
Any idea the formatting why doesn't work?

Without trying to guess what the function is meant to do, you gotta fix the border property, and set it equal to the intended value instead of call it like a method
Also it's "border" instead of "boder", also just the property "solid" usually doesn't do anything unless there are other hidden html rules somewhere that define the width and color, if not hey have to be added
Also, from the latter part of the code it seems daynumber is an HTML element since you are setting the style, yet in the beginning you are adding it to other HTML strings implying it is a string or number. Also in the if statement it appears dayname is an HTML input element since you are reading it's value property, yet in the second part of the if statement you are checking if it itself is equal to 0, implying it is a number, I'm guessing for the second part of that if statement you wanted to check the value again, also I'm guessing daynumber is div element or something similar, since borders usually aren't assigned to inputs unless they have some kind of custom border, so I'm guessing you intended to add the innerHTML property of daynumber to the other innerHTML property. Let me know if there was a different intention
document.getElementById("days").innerHTML = document.getElementById("days").innerHTML + daynumber . innerHTML
if(dayname.value==6 || dayname.value==0)
{
daynumber.style.border = " 1px solid black";
}

send Javascript variable to .css({transform: translate (var,var)})

I wanted to move a div 136px to right with transform property so i wrote:
`
$(".the_div").css({"transform":"translate(136px,0px)"});
and the_div class contains
.the_div
{
transition-duration:2s;
}
and it worked but now i want to send a javascript variable instead of 136px.
is that possible? how can i do that?
a variable like
var my_width = window.innerwidth * 0.1;
i wrote
$(".the_div").css({"transform":"translate(my_width+'px',0px)"});
and it obviously didnt work.
do you have an idea to move a div One-tenth of screen width to right (using transform property)?

You can do this in pure Javascript as well using template strings.
(PS - you don't even need JQuery)
First, save the div in a variable
const theDiv = document.querySelector('.the_div');
Second, save the value you want to translate in a variable
let number = 136;
Lastly, set the style attribute of the div
theDiv.style.transform = `tranlate(${number}px,0)`;
Hope this helps answer your question
Here is a helpful link for template strings
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals

simply you just need concatenate variable in string in javascript " + my_width + "
$(".the_div").css({"transform":"translate(" + my_width + "px,0px)"});

Adding and Displaying Array Issue

var reset = function ()
{
var p = parseFloat($("#IA").val());
var q = parseFloat($("#IB").val());
var m = parseFloat($("#CGCD").val());
var aR = [];
aR += ["GCD(" + p + "," + q + ")=" + m];
document.getElementById("PGCD").innerHTML = aR + "\n";
document.getElementById("IA-error").innerHTML="";
document.getElementById("IB-error").innerHTML="";
$("#IA").focus();
};
The code above is only for a 'reset' function, a part of additional code (not present), the purpose which is to find the Greatest Common Denominator, GCD.
My 'reset' function is connected to a button, #reset, the purpose of which is to do four things:
add and store the string GCD(p,q)=m to the array 'aR'; p/q/m are variable stand-ins for the values of the input text areas #IA, #IB, and #CGCD (the GCD of #IA and #IB);
display the array 'aR' in a text-area #PGCD each time the reset button is clicked; this is why I used an array;
clear the two input text areas #IA and #IB;
clear the one output text area;
As it stands, all four objectives are completed successfully, with one exception: for the second objective, only the most recent GCD calculation is outputted; none of the previous calculations output.
I cannot get the array to list the different saved calculations within it. I think (?) the new calculations are being added to the array, but I am not sure.
I've tried a 'for' statement, and an 'if' statement, neither of which worked. I don't know whether I coded it wrong, or if it wasn't the right solution for my issue.
I tried to search the forums (here) for a solution, but was unable to find one.
Thank you.

If I'm understanding what you are describing, I believe your problem is that you are attempting to use += to add elements to an array. You should use
aR.push("GCD(" + p + "," + q + ")=" + m);
The += operator is used for addition of a value to itself as well as string concatenation.
Edit: per comments below, the main issue was declaration of aR as a local variable. It needs to be either global or declared within the same scope.

Splitting a long phrase into an array

I need to take the phrase
It’s that time of year when you clean out your closets, dust off shelves, and spruce up your floors. Once you’ve taken care of the dust and dirt, what about some digital cleaning? Going through all your files and computers may seem like a daunting task, but we found ways to make the process fairly painless.
and upon pressing a button
split it into an array
iterate over that array at each step
Build SPAN elements as you go, along with the attributes
Add the SPAN elements to the original DIV
Add a click handler to the SPAN elements, or to the DIV, which causes the style on the SPAN to change on mouseover.
So far I had
function splitString(stringToSplit, separator) {
var arrayOfStrings = stringToSplit.split(separator);
print('The original string is: "' + stringToSplit + '"');
print('The separator is: "' + separator + '"');
print("The array has " + arrayOfStrings.length + " elements: ");
for (var i=0; i < arrayOfStrings.length; i++)
print(arrayOfStrings[i] + " / ");
}
var space = " ";
var comma = ",";
splitString(tempestString, space);
splitString(tempestString);
splitString(monthString, comma);
for (var i=0; i < myArray.length; i++)
{
}
var yourSpan = document.createElement('span');
yourSpan.innerHTML = "Hello";
var yourDiv = document.getElementById('divId');
yourDiv.appendChild(yourSpan);
yourSpan.onmouseover = function () {
alert("On MouseOver");
}
and for html I have
The DIV that will serve as your input (and output) is here, with
id="transcriptText":</p>
<div id="transcriptText"> It’s that time of year when you clean out your
closets, dust off shelves, and spruce up your floors. Once you’ve taken
care of the dust and dirt, what about some digital cleaning? Going
through all your files and computers may seem like a daunting task, but
we found ways to make the process fairly painless.</div>
<br>
<div id="divideTranscript" class="button"> Transform the
Transcript! </div>
Any help on how to move one? I have been stuck for quite some time

Well, first off this looks like homework.
That said, I'll try to help without giving you the actual code, since we're not supposed to give actual working solutions to homework. You're splitting the string too many times (once is all that's needed based on the instructions you gave) and you have to actually store the result of the split call somewhere that your other code can use it.
Your instructions say to add attributes to the span, but not which attributes nor what their contents should be.
Your function should follow the instructions:
1) Split the string. Since it doesn't specify on what, I'd assume words. So split it on spaces only and leave the punctuation where it is.
2) with the array of words returned from the split() function, iterate over it like you attempt to, but inside the braces that scope the loop is where you want to concatenate the <span> starting and ending tags around the original word.
3) use the document.createElement() to make that current span into a DOM element. Attach the mouseover and click handlers to it, then appendChild() it to the div.
add the handler to your button to call the above function.
Note that it's possibly more efficient to use the innerHTML() function to insert all the spans at once, but then you have to loop again to add the hover/click handlers.