typed-utilities/build/Option.js

Strongly typed general purpose utilities

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.Option = void 0;

var _Either = require("./Either");

function isSome(option) {
  return _Either.Either.is.left(option);
}

function assertSome(option, message) {
  if (!isSome(option)) {
    throw new TypeError(message ?? `option should be 'some'`);
  }
}

function isNone(option) {
  return _Either.Either.is.right(option);
}

function assertNone(option, message) {
  if (!isNone(option)) {
    throw new TypeError(message ?? `option should be 'none'`);
  }
}

const toSomeValue = option => option[1];

const is = {
  some: isSome,
  none: isNone
};
const assert = {
  some: assertSome,
  none: assertNone
};
const of = {
  some: value => _Either.Either.of.left(value),
  none: () => _Either.Either.of.right(null)
};
const to = {
  someValue: toSomeValue
};

const match = (option, match) => isSome(option) ? match.some(option[1]) : match.none();

const Option = {
  is,
  assert,
  of,
  to,
  match
};
exports.Option = Option;
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