String identity template tag

[T.J. Crowder]

On Thu, Dec 13, 2018 at 6:37 PM T.J. Crowder
<tj.crowder at farsightsoftware.com> wrote:
>
> But called normally, it's a useful helper, for instance in
> Isiah's `escape`...

Going through the process of the example for my message just now made me
think more about this function. Suppose it:

1. Accepted an array of substitutions rather than a rest parameter, and

2. Accepted an optional mapping function

Then, what I wrote on my last message as:

```js
const escape = (strings, ...subs) => {
    return String.cook(strings, ...subs.map(escapeHTML));
};
```

would be

```js
const escape = (strings, ...subs) => *String.cook(strings, subs,
escapeHTML)*;
```
(http://jsfiddle.net/n6p7xcvm/1/)

...while still supporting the earlier usage (just without spread) if
desired.

-- T.J. Crowder
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