Redundant match default

Match has a default case
But it is something completely different from .default, which makes sense
However, it can lead to writing the same code 2 times.
In particular, this can be seen in the Fluent API:

const sortDirectionMatch = match
  .case('"DESC"', () => desc)
  .case('"ASC"', () => asc)
  .default(() => none)
  .default(() => none)

const sortDirectionMatch = match
  .case('"DESC"', () => desc)
  .case('"ASC"', () => asc)
  .default(() => none)
  .default(() => none)

Is there a build-in way to do this? E.g.

const sortDirectionMatch = match({
  '"DESC"': () => desc,
  '"ASC"': () => asc,
  'default?': () => none,
})
// or
const sortDirectionMatch = match
  .case('"DESC"', () => desc)
  .case('"ASC"', () => asc)
  .default(() => none, true)

const sortDirectionMatch = match({
  '"DESC"': () => desc,
  '"ASC"': () => asc,
  'default?': () => none,
})
// or
const sortDirectionMatch = match
  .case('"DESC"', () => desc)
  .case('"ASC"', () => asc)
  .default(() => none, true)

Or is it best to just make a wrapper that adds these 2 versions like (untyped):

function optionalMatch(matchDraft, defaultCb) {
  return matchDraft
    .default(defaultCb)
    .default(defaultCb);
}

function optionalMatch(matchDraft, defaultCb) {
  return matchDraft
    .default(defaultCb)
    .default(defaultCb);
}

arktype•12mo ago•

4 replies

Untlsn

Redundant match default

const sortDirectionMatch = match
  .case('"DESC"', () => desc)
  .case('"ASC"', () => asc)
  .default(() => none)
  .default(() => none)

const sortDirectionMatch = match
  .case('"DESC"', () => desc)
  .case('"ASC"', () => asc)
  .default(() => none)
  .default(() => none)

Is there a build-in way to do this? E.g.

const sortDirectionMatch = match({
  '"DESC"': () => desc,
  '"ASC"': () => asc,
  'default?': () => none,
})
// or
const sortDirectionMatch = match
  .case('"DESC"', () => desc)
  .case('"ASC"', () => asc)
  .default(() => none, true)

const sortDirectionMatch = match({
  '"DESC"': () => desc,
  '"ASC"': () => asc,
  'default?': () => none,
})
// or
const sortDirectionMatch = match
  .case('"DESC"', () => desc)
  .case('"ASC"', () => asc)
  .default(() => none, true)

Or is it best to just make a wrapper that adds these 2 versions like (untyped):

function optionalMatch(matchDraft, defaultCb) {
  return matchDraft
    .default(defaultCb)
    .default(defaultCb);
}

function optionalMatch(matchDraft, defaultCb) {
  return matchDraft
    .default(defaultCb)
    .default(defaultCb);
}

Redundant match default

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