Function: mapOr()
Call Signature
mapOr<
T,U>(orU,mapFn,maybe):U
Map over a Maybe instance and get out the value if maybe is a Just, or return a default value if maybe is a Nothing.
Examples
const length = (s: string) => s.length;
const justAString = Maybe.just('string');
const theStringLength = mapOr(0, length, justAString);
console.log(theStringLength); // 6
const notAString = Maybe.nothing<string>();
const notAStringLength = mapOr(0, length, notAString)
console.log(notAStringLength); // 0Type Parameters
T
T
The type of the wrapped value.
U
U
The type of the wrapped value of the returned Maybe.
Parameters
orU
U
The default value to use if maybe is Nothing
mapFn
(t) => U
The function to apply the value to if Maybe is Just
maybe
Maybe<T>
The Maybe instance to map over.
Returns
U
Call Signature
mapOr<
T,U>(orU,mapFn): (maybe) =>U
Map over a Maybe instance and get out the value if maybe is a Just, or return a default value if maybe is a Nothing.
Examples
const length = (s: string) => s.length;
const justAString = Maybe.just('string');
const theStringLength = mapOr(0, length, justAString);
console.log(theStringLength); // 6
const notAString = Maybe.nothing<string>();
const notAStringLength = mapOr(0, length, notAString)
console.log(notAStringLength); // 0Type Parameters
T
T
The type of the wrapped value.
U
U
The type of the wrapped value of the returned Maybe.
Parameters
orU
U
The default value to use if maybe is Nothing
mapFn
(t) => U
The function to apply the value to if Maybe is Just
Returns
(
maybe):U
Parameters
maybe
Maybe<T>
Returns
U
Call Signature
mapOr<
T,U>(orU): (mapFn) => (maybe) =>U
Map over a Maybe instance and get out the value if maybe is a Just, or return a default value if maybe is a Nothing.
Examples
const length = (s: string) => s.length;
const justAString = Maybe.just('string');
const theStringLength = mapOr(0, length, justAString);
console.log(theStringLength); // 6
const notAString = Maybe.nothing<string>();
const notAStringLength = mapOr(0, length, notAString)
console.log(notAStringLength); // 0Type Parameters
T
T
The type of the wrapped value.
U
U
The type of the wrapped value of the returned Maybe.
Parameters
orU
U
The default value to use if maybe is Nothing
Returns
(
mapFn): (maybe) =>U
Parameters
mapFn
(t) => U
Returns
(
maybe):U
Parameters
maybe
Maybe<T>
Returns
U