Function patternMap

Constructs a larger map from a list of patterns and their corresponding maps.

Example

const default_map = leaf_map("foobar");

const map = pattern_map([
  default_map,
     ["foo", leaf_map("foo")],
  ["bar", leaf_map("bar")],
]);

await map(); // "foobar"
await map("foo")(); // "foo"
await map("bar")(); // "bar"
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Todo

Implement more patterns than just a simple symbol match.