Simple JS task that implement a template function

Implement a JavaScript class that when supplied with a templateincluding tags enclosed in double curly braces ( e.g. {{sometag}})produces a string with the tags replaced by values found in aname-value-pair map i.e. a simple JavaScript object.

For example, after running the following code:const t = newTemplater('Hello {{tag}}');let s = t.apply({tag: 'World'});Thevariable swill have the value 'Hello World'.

How does this work ?