container.js
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	import * as _ from 'ramda';
	export class Container {
	constructor(f) {
	this.__value = f;
	}

	static of(value) {
	return new Container(() => value);
	}

	get value() {
	return this.__value();
	}

	map(f) {
	return this.hasNothing() ? Container.of(null) : Container.of(f(this.value));
	}

	join() {
	return this.hasNothing()? Container.of(null) : this.value;
	}

	chain(f) {
	return this.map(f).join();
	}

	hasNothing() {
	return this.value === null \|\| this.value === undefined;
	}

	ap(otherContainer) {
	otherContainer.map(this.value);
	}
	}