Tiny template engine

template.js

const compile = (str, data, delimiters = /<%|%>/) => {
    const expressionRegex = /(^( )?(if|for|else|switch|case|break|{|}|let|const|var))(.*)?/g;
    const result = [
        "const r = [];",
        ...str.split(delimiters).map((t, i) => {
            return i % 2 === 0 ? `r.push(\`${t}\`);` : (t.match(expressionRegex) ? t : `r.push(${t});`);
        }),
        `return r.join("");`,
    ];
    return new Function(result.join("")).apply(data);
};