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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| /* | ||
| * Licensed to Elasticsearch B.V. under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch B.V. licenses this file to you under | ||
| * the Apache License, Version 2.0 (the "License"); you may | ||
| * not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
|
|
||
| /* eslint new-cap: 0 */ | ||
| /* eslint no-unused-vars: 0 */ | ||
|
|
||
| /** | ||
| * Just monad used for valid values | ||
| */ | ||
| export function Just(x) { | ||
| return { | ||
| value: () => x, | ||
| map: (f) => Maybe.of(f(x)), | ||
| isJust: () => true, | ||
| inspect: () => `Just(${x})`, | ||
| }; | ||
| } | ||
| Just.of = function of(x) { | ||
| return Just(x); | ||
| }; | ||
| export function just(x) { | ||
| return Just.of(x); | ||
| } | ||
|
|
||
| /** | ||
| * Maybe monad. | ||
| * Maybe.fromNullable` lifts an `x` into either a `Just` | ||
| * or a `Nothing` typeclass. | ||
| */ | ||
| export function Maybe(x) { | ||
| return { | ||
| chain: (f) => f(x), | ||
| map: (f) => Maybe(f(x)), | ||
| inspect: () => `Maybe(${x})`, | ||
| nothing: () => Nothing(), | ||
| isNothing: () => false, | ||
| isJust: () => false, | ||
| }; | ||
| } | ||
| Maybe.of = function of(x) { | ||
| return just(x); | ||
| }; | ||
|
|
||
| export function maybe(x) { | ||
| return Maybe.of(x); | ||
| } | ||
| export function fromNullable(x) { | ||
| return x !== null && x !== undefined && x !== false && x !== 'undefined' ? just(x) : nothing(); | ||
| } | ||
|
|
||
| /** | ||
| * Nothing wraps undefined or null values and prevents errors | ||
| * that otherwise occur when mapping unexpected undefined or null | ||
| * values | ||
| */ | ||
| export function Nothing() { | ||
| return { | ||
| value: () => { | ||
| throw new TypeError(`Nothing algebraic data type returns...no value :)`); | ||
| }, | ||
| map: (f) => {}, | ||
| isNothing: () => true, | ||
| inspect: () => `[Nothing]`, | ||
| }; | ||
| } | ||
| export function nothing() { | ||
| return Nothing(); | ||
| } |
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