b2whats

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

b2whats

let slice = Array.prototype.slice;
let str = s => slice.call(s)
let unstr = cs => cs.reduce((c, cs) => c + cs, "")
let concat = xss => xss.reduce((xs, ys) => xs.concat(ys), [])
let id = x => x
let negate = x => -x
let add = (x,y) => x + y
let sub = (x,y) => x - y

// type Parser a = () -> [Char] -> a

b2whats

/*eslint-disable no-console, radix*/
import webpack from 'webpack';
import path from 'path';
import writeStats from './writeStats';
import ExtractTextPlugin from 'extract-text-webpack-plugin';
import CleanPlugin from 'clean-webpack-plugin';
import autoprefixer from 'autoprefixer-core';
import webpackStripLoader from 'strip-loader';
import { host, webpackPort, buildDir } from '../config';

b2whats

import * as NotificationAction from 'actions/NotificationActions'
импортов может и не быть, если мы в обработчике нативно обрабатываем запросы

export default function 404({ status, statusText }, dispatch, getState) {
  if (status === 404) {
    dispatch(NotificationAction.send({message: statusText}))
  }
}

Таких файлов будет ровно столько сколько будет обработчиков

b2whats

typeof NaN == 'number';
42 == [[[[[[[42]]]]]]];
'foo' > 'bar';
NaN != NaN;

null >= 0 // true, т.к. null преобразуется к 0
null > 0 // false т.к. null преобразуется к 0
null == 0 // false

5 - '3' === 2

b2whats

/* jshint esnext:true */

/**
 * "Producer-Consumer" implementation using generators.
 * @see http://en.wikipedia.org/wiki/Deterministic_concurrency#Comparison_with_generators
 */

var SIZE = 3,
    queue = newQueue();

b2whats

// array utils
// =================================================================================================

const combine = (...arrays) => [].concat(...arrays);

const compact = arr => arr.filter(Boolean);

const contains = (() => Array.prototype.includes
  ? (arr, value) => arr.includes(value)
  : (arr, value) => arr.some(el => el === value)

b2whats

@kangax's ES6 quiz, explained

@kangax created a new interesting quiz, this time devoted to ES6 (aka ES2015). I found this quiz very interesting and quite hard (made myself 3 mistakes on first pass).

Here we go with the explanations:

Question 1:

(function(x, f = () => x) {

b2whats

/* jshint esnext:true */

// native generators

function* random() {
    var i = 0;
    while(i++ < 1e5) {
        yield Math.random();
    }
}

b2whats

const loop = (() => {
  const recur = (callback, count, i=0) => {
    if (i == count-1) return callback(i);
    callback(i);
    return recur(callback, count, i+1);
  };
  return (callback, count) => {
    if (count > 0) return recur(callback, count);
  };
})();