tagged-template-string.js

function html(pieces, ...substitutions) {
    var result = pieces[0]
    for (var i = 0; i < substitutions.length; i++) {
        result += escape(substitutions[i]) + pieces[i + 1];
    }

    return result;
}

function escape(s) {
    return s.replace(/&/g, "&amp;")
            .replace(/</g, "&lt;")
            .replace(/>/g, "&gt;")
            .replace(/'/g, "&apos;")
            .replace(/"/g, "&quot;");
}

console.log(html`<b>${process.argv[2]} says</b>: "${process.argv[3]}"`)