Tushar Mathur tusharmath

Scala Cheatsheet

Type Constructors

case classes that help use create new type of objects. For instance List is a type constructory.

Higher Kinded Types

Generic types that take parameters such as —

trait Foo[T[_]] {
 def bar(x: T[Int]): Unit

#Core Idea

easy to start with and tough to master
brainstorming

#d11hack

We started off brain storming almost a week prior to the event about various problems that might get people interested in them. The [Web Crawler](link to the problem statement) was one which was the right balance of complexity and fun and adhered to our philosophy of

A good game is easy to start with but tough to master.

#Core Idea

easy to start with and tough to master
brainstorming

#d11hack

We started off brain storming almost a week prior to the event about various problems that might get people interested in them. The [Web Crawler](link to the problem statement) was one which was the right balance of complexity and fun and adhered to our philosophy of

A good game is easy to start with but tough to master.

	#!/usr/bin/env bash

	git ls-files \| \
	grep -E '.*(css\|ts\|graphql)$' \| \
	xargs prettier --print-width 80 --single-quote --no-semi --no-bracket-spacing --write

	const Set = (lens, value, target) => lens.set(value, target)
	const View = (lens, target) => lens.get(target)
	const Over = (lens, func, target) =>
	Set(lens, func(View(lens, target), target), target)

	const Compose = (...lenses) => {
	lenses = lenses.reverse()
	const itar = (i, target, value) => {
	if (i === lenses.length) return value
	return lenses[i].set(itar(i + 1, lenses[i].get(target), value), target)

	const R = require('ramda')
	const O = require('observable-air')
	const axios = require('axios')
	const { JSDOM } = require('jsdom')

	const makeRequest = url =>
	axios.get(url).then(response => response.data).then(html => new JSDOM(html))
	const fetchDOM = url => O.multicast(O.fromPromise(() => makeRequest(url)))
	const fromArray = R.compose(O.fromArray, Array.from)
	const findE = R.curry((sel, dom) =>

	#!/usr/bin/env bash

	git fetch origin
	commitID=`git log origin/master..HEAD --oneline --pretty=format:"%h" \| tail -1`
	git rebase --onto origin/master $commitID~1 -i --preserve-merges --autosquash

	const flatMapLatest = (fn, stream) =>
	stream.publish(s => s.flatMap(v => fn(v).takeUntil(s)));

	const flatMapLatest = (fn, stream, resultSelector) => stream.publish(s => {
	return s.flatMap(v => fn(v).map(v2 => resultSelector(v, v2)).takeUntil(s));
	});

	const delay = (source, delay) => source.flatMap(e => Rx.Observable.timer(delay).mapTo(e))

	const debounceTime = (time, stream) => flatMapLatest(v => of(v).delay(time), stream);

	const typeOf = ob => ob.toString()

	const forEach = (fn, l) => typeOf(l) === '[object Object]'
	? forEach(k => fn(l[k], k), Object.keys(l))
	: Array.from(l).forEach(fn)

	export const patch = (elm, node) => {
	if(elm === node) return elm
	if(typeOf(elm) === '[object Text]') {
	elm.textContent = node.textContent