JavaScript - Understanding the varying results of an if/else statement when utilizing a previously declared variable

I have a query regarding the code snippet provided below:

var d = new Date();
var weekday = ["su", "mo", "tu", "we", "th", "fr", "sa"];
var deliver = weekday[d.getDay()];

if(condition){
    if(d.getDay() == 1){
       d.setHours(d.getHours() + 24); // adds a day
    }
    if(d.getUTCMonth() == 0 && d.getUTCDate() == 1){
        // do something
    } else {
        // version 1 or version 2
    }
}

//version 1: var deliver = weekday[d.getDay()];
//           document.getElementById("leverdatum").innerHTML = deliver;

//version 2: document.getElementById("leverdatum").innerHTML = deliver;;

I'm puzzled as to why the output is "tu" when using version 1, and "mo" when using version 2. Can you explain this behavior?

javascript

Answer №1

The presence or absence of the keyword var in that specific line has no impact whatsoever.

What truly matters is the statement = weekday[d.getDay()];.

Given that it is currently Monday, executing 

d.setHours(d.getHours() + 24); // adds a day
will result in adding one day to the date, making it Tuesday.

However, if you fail to convert the value of d into a day and assign it to deliver after modifying the value of d, the original string will persist.

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