The tutor shares an observation about the concat() function.

The concat() function is used to join one or more strings to the end of another:

var strng0 = “This string, “;
var strng1 = “then this one”
var strng2 = “:)”
var strng3 = strng0.concat(strng1,strng2);
document.getElementById(“output”).innerHTML = strng3;

will display

This string, then this one:)

In my experience, a literal string can also be used at the front:

var strng_a = “then this one”
var strng_b = “:)”
var strng_c = “This string, “.concat(strng_a,strng_b);
document.getElementById(“output”).innerHTML = strng_c;

will also display

This string, then this one:)

Source:

www.w3schools.com

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.