monad-ts
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Monad-ts is a small library implements some of key monads and way to chain them in a pipe (flow) in JavaScript and TypeScript. Angular 2+ compatible.
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<li data-ice="doc"><span data-ice="kind" class="kind-class">C</span><span data-ice="name"><span><a href="class/src/asyncFlow.js~AsyncFlow.html">AsyncFlow</a></span></span></li>
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<li data-ice="doc"><div data-ice="dirPath" class="nav-dir-path">services</div><span data-ice="kind" class="kind-function">F</span><span data-ice="name"><span><a href="function/index.html#static-function-cast">cast</a></span></span></li>
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<li data-ice="doc"><span data-ice="kind" class="kind-function">F</span><span data-ice="name"><span><a href="function/index.html#static-function-equality">equality</a></span></span></li>
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<li data-ice="doc"><span data-ice="kind" class="kind-typedef">T</span><span data-ice="name"><span><a href="typedef/index.html#static-typedef-MF<T,U>">MF<T,U></a></span></span></li>
<li data-ice="doc"><span data-ice="kind" class="kind-typedef">T</span><span data-ice="name"><span><a href="typedef/index.html#static-typedef-Pr<U>">Pr<U></a></span></span></li>
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<div class="content" data-ice="content"><h1 data-ice="title">src/identity.js</h1>
<pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { Monad } from "./monad";
import { clone } from "./services/clone";
import { equality } from "./services/equality";
import { ErrorM } from "./error";
/**
* Class Identity - wraps underlying value into the monadic value and compute results from a monadic value.
* @extends {Monad}
*/
export class Identity extends Monad {
/**
* Creates an instance of class Identity.
* @param {any} [v] - The initial state of app.
* */
constructor(v) {
super();
/**
* Keeps underlying value of a monad.
* @type {any}
*/
this.v = clone(v);
/**
* The instance of ErrorM.
* @type {ErrorM}
*/
this.err = new ErrorM();
}
/**
* Chains the operations on a monadic value.
* @method bind
* @param {MF<T, U>} f - transformation function for the monad.
* @param {any} [v = this.v]- underlying value for the monad, it can be null.
* @return {Pr<U> | Error}
*/
bind(f, v = this.v) {
return this.v && v
? equality(this.v, v)
? f(v)
: this.fail('Identity.bind() - underlying value of the monad have defined in the constructor!')
: v || v === 0 || v === '' || v === null
? f(v)
: f();
}
}
//Copyright (c) 2017 Alex Tranchenko. All rights reserved.
</code></pre>
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