Function mapOr

Map over a Result instance as in map and get out the value if result is an Ok, or return a default value if result is an Err.

Examples

import { ok, err, mapOr } from 'true-myth/result';

const length = (s: string) => s.length;

const anOkString = ok('a string');
const theStringLength = mapOr(0, anOkString);
console.log(theStringLength);  // 8

const anErr = err('uh oh');
const anErrMapped = mapOr(0, anErr);
console.log(anErrMapped);  // 0
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