decoratedFns.js

const data = {
  selected: 2,
  opts: [
    {id: 1, name: `A`},
    {id: 2, name: `B`},
    {id: 3, name: `C`},
  ]
};

const selected = (a, b) => R.equals(a, b) ? `selected="selected"` : ``;

const Opt = R.curry((selectedItem, props) => `
<option value="${props.id}" ${selected(selectedItem, props.id)}>
    ${props.name}
</option>`);

const Opts = props => R.compose(
    R.join(``),
    R.map(Opt(props.selected))
)(props.opts);

const selectList = props => `
<select>
    ${Opts(props)}
</select>`;

selectList(data)