Function: map()

map<T, U, E>(result, fn): Result<U, E>

Defined in: src/types/result.ts:253

Maps a function over the success value of a Result.

Type Parameters

• T

Original success value type

• U

Transformed success value type

• E extends Error

Error type

Parameters

result

Result<T, E>

Result to map over

fn

(value) => U

Transformation function

Returns

Result<U, E>

New Result with transformed value, or original error

Remarks

If the Result is Ok, applies the function to the value and wraps the result in Ok. If the Result is Err, returns the error unchanged.

Example

const result = Ok(5);
const doubled = map(result, (x) => x * 2);
// Ok(10)

const errorResult = Err(new Error('Failed'));
const mapped = map(errorResult, (x) => x * 2);
// Err(Error('Failed'))