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

	static of(value) {
	return new Container(function() {
	return value;
	});
	}

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

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

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