ex2.js

function makeMarkup(tag) {
    return function(content) {
        return "<" + tag + ">" + content + "</" + tag + ">";
    };
}

var makeP = makeMarkup("p");
var makeH1 = makeMarkup("h1");

console.log(makeH1("This is my header")); // <h1>This is my header</h1>
console.log(makeP("This is my paragraph")); // <p>This is my paragraph</p>