[ianbicking]

Hey Paul!

I think JSX is an example of the somewhat crude but practical use of simple execution patterns. For instance if you have a loop you do:

    return <ol>
      {items.map((item, i) => <li key={i}>{item}</li>)}
    </ol>;

Which isn't really templating at all, but just the ability to use inline expressions and easily construct objects does get the job done.

Or in a SQL builder with JavaScript tagged templates, I do:

    exec(sql`
      SELECT * FROM a_table
      WHERE category = ${category}
        ${subcategory ? sql`AND subcategory=${subcategory}` : sql``}
    `)

That is, I nest tagged templates to handle different logic conditions and loops.

If there's deferred execution, it's done with ?: and .map() – though these very long expressions don't work nearly as well in Python. (List comprehension is in some ways better than .map()/.filter(), but not for very large expressions like in a JSX template.)