Sets & Maps

mapping

mapping( decoder: Decoder<T> ): Decoder<Map<string, T>> (source)

Similar to record(), but returns the result as a Map<string, T> (an ES6 Map) instead.

Try it

mapping(number).verify({ red: 1, blue: 2, green: 3 })

Input	Result
	…
	…

setFromArray( decoder: Decoder<T> ): Decoder<Set<T>> (source)

Similar to array(), but returns the result as an ES6 Set.

Try it

setFromArray(string).verify(['abc', 'pqr'])

sized( decoder: Decoder<Set<T>>, options: SizeOptions ): Decoder<Set<T>> (source)

Will be available once 2.9 is released.

Takes any set decoder and rejects values that don't match the given size constraints. Also works with strings and arrays.

SizeOptions accepts min, max, or size (shorthand for exact length).

Try it

sized(setFromArray(string), { min: 1, max: 3 }).verify(['a', 'b'])