src/lib/Fence.js

import Result from './Result';

/**
 * A 'built' FenceBuilder that can be exported for use in other functions.
 */
class Fence {
    /**
     * @param    {array}    invokables    Array of invokable functions
     */
    constructor(invokables) {
        this._invokables = invokables;
    }

    /**
     * Iterates over an array of invokables. Each invokable is called with a subject
     * which is the attribute value being validated.
     *
     * @param     {any}         subject     Some value to be validated
     * @return    {Result}                  An object representing invoked functions
     *                                      and their outputs
     */
    run(...subjects) {
        const invokables = this._invokables;
        const results = invokables.map(function(invokable) {
            return invokable.invoke.apply(invokable, subjects);
        });

        return new Result(invokables, results, subjects);
    }
}

export default Fence;