How to change a variable string inside another variable string from a function in javascript

Question

var str1 = "Pedro";
var str2 = "Bye " + str1;

function changeStr() {
  str1 = "Dom";
}

console.log("Before", str2);
changeStr();
console.log("After", str2);

I want the above code to print "Bye Dom" instead of "Bye Pedro". Also please attach the link from where I can get the conceptual knowledge for this.

str2 is never changed? What makes you think it would be different? — evolutionxbox
– evolutionxbox, Commented Jun 21, 2021 at 12:04
var str2 = "Bye " + str1; stores the string "Bye Pedro" in str2. Changing str1 afterwards doesn't change str2. — Andreas
– Andreas, Commented Jun 21, 2021 at 12:05
to change part of a string - you use the replace method - the conceptual knowledge for how you are doing it can be found in any javascript introduction — Jaromanda X
– Jaromanda X, Commented Jun 21, 2021 at 12:06

Quentin · Accepted Answer · 2021-06-21 12:04:45Z

2

var str2 = "Bye " + str1; will combine the two strings at the point in time it runs.

It doesn't create any kind of reference to the str1 variable.

It will not update the value of str2 if the value of str1 later changes.

If you want to change the value of str2 then you need to do so explicitly.

Generally, in this type of situation you would use a function instead of a string variable and every time you need the value call str2() to get the value computed from the latest value of str1.

answered Jun 21, 2021 at 12:04

Quentin

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