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  /* render a tweet using entities: for example
   * val e = Entity(10, 21, """<a href="https://twitter.com/search/?q=%23ScalaIntro">#ScalaIntro</a>""")
   * val entitites = Set(e)
   * render("I love my #ScalaIntro exercises!", entities)
   * should result in
   * """I love my <a href="https://twitter.com/search/?q=%23ScalaIntro">#ScalaIntro</a> exercises!"""
   * The "start" and "end" fields of an Entity refer to the indices in the
   * original string to be substituted with the html field; you may assume
   * that these indices are all non-overlapping.
  */

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// 2.1 Implement buildCar in parallel (orders in parallel)
def buildCarPar(): Future[Car] = Future.join(
  Factory.newChassis(),
  Factory.newWheels(),
  Future.join(
    Factory.newCylinder(),
    Factory.newPiston()
  ) flatMap { case (cylinder, piston) => buildEngine(cylinder, piston) }
  ) map { case (chassis, wheels, engine) => Car(chassis, wheels, engine) }

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steps = 5

(1..steps)
  .map { |x| (1..steps-1).map { |y| [x, y] } }
  .flatten(1)
  .select { |x, y| steps - x - y > 0 }
  .group_by { |x, y| x }
  .each do |x, sets|
    sets.each do |x, y|
      puts [x, y].inspect

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import React, { PropTypes } from 'react';
import ReactDOM from 'react-dom';

import d3 from 'd3';
import styles from './styles.css';

function getDefaultRange(axis, props) {
  switch (axis) {
    case 'x':
      return [0, props.width];

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import * as React from "react";
import { useContext, useEffect, useState } from "react";
import { render } from "react-dom";
import { applyMiddleware, bindActionCreators, createStore } from "redux";
import ReduxThunk from "redux-thunk";
import { createSelector, createStructuredSelector } from "reselect";
import { action, getType } from "typesafe-actions";

interface Post {
  id: number;