chain.js

import checkObjectType from './_helpers/checkobjecttype';
import * as universalMethods from './matreshka/_universalmethods';
import Class from './class';
import apply from './_helpers/apply';

// create a prototype of ChainClass
// store target object at "object" property
const prototype = {
    constructor(object) {
        this.object = object;
    }
};

const methodNames = Object.keys(universalMethods);

// iterate over all universal methods
for (let i = 0; i < methodNames.length; i++) {
    const methodName = methodNames[i];
    const method = universalMethods[methodName];

    // create every chained method
    prototype[methodName] = function chainedMethod() {
        const args = [this.object];

        nofn.forEach(arguments, (argument) => {
            args.push(argument);
        });

        apply(method, undefined, args);

        // returning this is important for chained calls
        return this;
    };
}

const ChainClass = Class(prototype);

// the function allows to chain static function calls on any object
export default function chain(object) {
    // check for type and throw an error if it is not an object and is not a function
    checkObjectType(object, 'chain');

    return new ChainClass(object);
}