Script to remove extra spaces in text blocks?

@Stephen Marsh 
@c.pfaffenbichler 
I get the same results using this, below.
Removes extra spaces but the styling still defaults.

/*
var doc = app.activeDocument;
try {
    if (doc.activeLayer.kind == LayerKind.TEXT) {
        doc.activeLayer.textItem.contents = doc.activeLayer.textItem.contents.replace(/ +/g, ' ');
    }
} catch (e) {}
*/


var aLay = app.activeDocument.activeLayer;
try{
if(aLay.textItem && aLay.textItem.contents != "") {


var changedText= aLay.textItem.contents.replace (/ +/g, ' ');

aLay.textItem.contents = changedText;

} 
} catch (e) {}

@Stephen Marsh I wonder if anything on this thread will work, to retain styling after script runs?
https://community.adobe.com/t5/photoshop-ecosystem-discussions/setting-a-font-on-a-psd-text-item-in-javascript/m-p/6876878#M458567 

@Stephen Marsh Also, sorry for all these messages, but is there a way to remove a space and an adjoining return or soft return..?
Along with the multiple space, or a separate jsx to deal with occurances of space followed by a return or soft return..?

@Stephen Marsh This script below, removes the spaces from the selected text layer, but it also removes all the formating, and defaults to the headline styling (font weight, size, color, etc).

Is there a way to retain the existing styling? 

var doc = app.activeDocument;

        app.activeDocument.activeLayer.kind == LayerKind.TEXT ;

            doc.activeLayer.textItem.contents = doc.activeLayer.textItem.contents.replace(/ +/g, ' ');
        

And if so, how would I load the script again? I remember there's a folders somewhere I need to put the script file into? 

---

Presets > Scripts 

In the program they are listed under File > Scripts 

@NDL_DH 

The following script will replace 1 or more word spaces with a single word space in the active document:

var doc = app.activeDocument;
for (var j = 0; j < doc.layers.length; j++) {
    try {
        doc.activeLayer = doc.layers[j];
        if (app.activeDocument.activeLayer.kind == LayerKind.TEXT) {
            doc.activeLayer.textItem.contents = doc.activeLayer.textItem.contents.replace(/ +/g, ' ');
        }
    } catch (e) {}
}

I am not sure if Photoshop has the same level of support as one would find in InDesign, I can't get a soft return (shift + return)  to work:

.replace(/\u2029/g, '')

Edit: Instructions for saving and installing script code here –

https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html

..I have a InDesign script that use to remove extra spacces, posted below.
Making a photoshop version of the below would be a good start..?

//reset GREP preferences
app.findGrepPreferences=app.changeGrepPreferences=null;


app.findGrepPreferences.findWhat="[~m~>~f~|~S~s~<~/~.~3~4~% ]{2,}";



app.changeGrepPreferences.changeTo="\\s";


 
var sel = app.selection;  
    for(var n=0;n<sel.length;n++)  
    {  
        sel[n].changeGrep();  
    };  


//reset GREP preferences
//app.findGrepPreferences=app.changeGrepPreferences=null;