jaf7

<script>
// A minimal polyfill for `navigator.clipboard.writeText()` that works most of the time in most modern browsers.
// Note that:
// - In Edge, this may call `resolve()` even if copying failed.
// - In Safari, this may fail if there is nothing selected on the page.
// See https://github.com/lgarron/clipboard-polyfill for a more robust solution.
// License: public domain
function writeText(str) {
  return new Promise(function(resolve, reject) {
    var success = false;

jaf7

import pymysql
import os.path
import sys
from configparser import ConfigParser

from pymysql import (escape_sequence, cursors)

sys.path.append(os.path.dirname(__file__))

config = ConfigParser()

jaf7

process.env.NODE_ENV = 'production';

const webpack = require('webpack');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
const webpackConfigProd = require('react-scripts/config/webpack.config')('production');

// this one is optional, just for better feedback on build
const chalk = require('chalk');
const ProgressBarPlugin = require('progress-bar-webpack-plugin');
const green = text => {

jaf7

import styled, { keyframes } from "styled-components";

const rotate360 = keyframes`
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }

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import React from 'react';
import styled from 'styled-components';

const Spinner = () => (
  <StyledSpinner viewBox="0 0 50 50">
    <circle
      className="path"
      cx="25"
      cy="25"
      r="20"

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let UserContext = React.createContext();

class App extends React.Component {
  state = {
    user: null,
    setUser: user => {
      this.setState({ user });
    }
  };

jaf7

I really liked @tjvantoll article Handling Failed HTTP Responses With fetch(). The one thing I found annoying with it, though, is that response.statusText always returns the generic error message associated with the error code. Most APIs, however, will generally return some kind of useful, more human friendly message in the body.

Here's a modification that will capture this message. The key is that rather than throwing an error, you just throw the response and then process it in the catch block to extract the message in the body:

fetch("/api/foo")
  .then( response => {
    if (!response.ok) { throw response }
    return response.json()  //we only get here if there is no error
 })

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"""
Results:

multiple_update: 57 ms
copy_and_update: 46 ms
dict_constructor: 56 ms
kwargs_hack: 45 ms
dict_comprehension: 45 ms
concatenate_items: 166 ms
union_items: 163 ms

jaf7

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

import mimetypes
import argparse

from django.utils.encoding import force_text
from django.utils.translation import ugettext as _
from django.core.management.base import BaseCommand
from django.db import transaction

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function asyncThread(fn, ...args) {
  if (!window.Worker) throw Promise.reject(
    new ReferenceError(`WebWorkers aren't available.`)
  );
  
  const fnWorker = `
  self.onmessage = function(message) {
    (${fn.toString()})
      .apply(null, message.data)
      .then(result => self.postMessage(result));