Function maybe

maybe<THING>(value?: THING | null, is?: Predicate<THING>): Maybe<THING>

maybe('something').map(value => value + ' more').orNull() // produces: "something more"
maybe(null).map(value => value + ' more').orNull() // produces: null
maybe(undefined).map(value => value + ' more').orNull() // produces: null
maybe(NaN).map(value => value + ' more').orNull() // produces: null

Type Parameters

THING

Parameters

Optionalvalue: THING | null
is: Predicate<THING> = isSomethingValue

Returns Maybe<THING>

Default Value

for isSomething === not('undefined' || type === 'null' || type === 'nan')