yarn add perfect-matcher

npm install perfect-matcher

• match by value (include deep compare with objects, Date, array, typed arrays)
• match by type
• match by instance
• match NaN, regexp, positive/negative number
• match tuple
• optional matching objects

z81.github.io/matcher

console.log(
  match(7)(
    value('str', v => console.log(`This is string "${v}"`)),
    value(7, v => console.log('This is number 7') && 'return this'),
    value({ a: '2' }, v => console.log("This is {a: '2'}", v)),
    value({ a: '3' }, v => console.log("This is {a: '3'}")),
    value(null, v => console.log('This is null')),
    value(false, v => console.log('This is false')),
    type(0, () => console.log('This is number')),
    string(() => console.log('This is string')),
    boolean(() => console.log('This is boolean')),
    regexp(() => console.log('This is RegExp')),
    nan(() => console.log('This is NaN')),
    array(() => console.log('This is array')),
    instance(Store, () => console.log('This is Store'))
  )
)

console.log(
  match(['firstName'] as [string, string?])(
    tuple((firstName, lastName) => `${firstName} ${lastName}`),
    tuple(firstName => `${firstName}`)
  )
  // "firstName"
)