Simple JS Closure Example

What is a javascript closure?  Here is a brief description provided by the Mozilla Developer Docs:

A closure gives you access to an outer function's scope from an inner function.

In other words,  a closure gives you the ability to access a parent level scope from a child scope even after the parent function has been terminated.

EX:

function myGuitar(str1 = ""){
  let coolGtr = `${str1}`;

  return function(yearPurchased){
    let today_date = new Date();
    let today_year = today_date.getFullYear();
    let yearsPlayed = today_year - yearPurchased;
    return `My favorite guitar is a ${coolGtr} 🎸 🎸 🎸 🎸 I have been playing it for about ${yearsPlayed} years now.`;
  }
}

let tomCat = myGuitar("Pure Salem Tomcat");
let myTomcat = tomCat(2014);
myTomcat;

The resulting output looks like this:

'My favorite guitar is a Pure Salem Tomcat   🎸 🎸 🎸 🎸 I have been playing it for about 8 years now.'

Pretty nifty!!