bimap

Transforms each side of a Result with a function, without changing the context of the computation. That is, Errors will still be Errors, Oks will still be Oks.

This feature is experimental!

This API is still experimental, so it may change or be removed in future versions. You should not rely on it for production applications.

Signature

Type(what is this?)

(Result a b).((a) => c, (b) => d) => Result c d

Documentation

Transforms each side of a Result with a function, without changing the context of the computation. That is, Errors will still be Errors, Oks will still be Oks.

Example:

const Result = require('folktale/result');

const inc = (x) => x + 1;
const dec = (x) => x - 1;


Result.Ok(1).bimap(inc, dec);
// ==> Result.Ok(dec(1))

Result.Error(1).bimap(inc, dec);
// ==> Result.Error(inc(1))

Properties

Source Code

Defined in source/result/result.js at line 75, column 19

{
    /*~*/
    Error: function bimap(f, g) {
      assertFunction('Result.Error#bimap', f);
      assertFunction('Result.Error#bimap', g);
      return Error(f(this.value));
    },

    /*~*/
    Ok: function bimap(f, g) {
      assertFunction('Result.Ok#bimap', f);
      assertFunction('Result.Ok#bimap', g);
      return Ok(g(this.value));
    }
  }