matthew-gerstman

import React from 'react';
import './App.css';

class App extends React.Component {
  state = {anonymousFunctions: true, count: 100};
  updateCount = e => {
    this.setState({count: e.target.value});
  };
  updateAnonymous = () => {
    this.setState({anonymousFunctions: !this.state.anonymousFunctions});

matthew-gerstman

let lastFocused = [];
setInterval(() => {
  const focused = document.querySelector(':focus');
  if (focused && lastFocused[lastFocused.length - 1] != focused) {
    lastFocused.push(focused);
  }
}, 100)

matthew-gerstman

function handleAsManyLicenseCases(data, licenseID) {
  const returnableLicense = {
    allLicenses: [],
    licenseStatement: licenseID,
    spdx: {
      osi: false,
      fsf: false,
      fsfAndOsi: false,
      deprecated: false,
    },

matthew-gerstman

function filter(list, predicate) {
  return list.reduce((acc, item) => {
    if (predicate(item)) {
      acc.push(item);
    }
    return acc;
  }, []);
}

matthew-gerstman

function map(list, func) {
  return list.reduce((acc, item) => {
    acc.push(func(item));
    return acc;
  }, []);
}

matthew-gerstman

[
  "Harry Potter",
  "Gryffindor",
  40,
  "Hermione Granger",
  "Gryffindor",
  140,
  "Draco Malfoy",
  "Slytherin",
  -20,

matthew-gerstman

function flatMap(list, func) {
  return list.reduce((acc, item) => {
    const mappedItem = func(item);
    if (Array.isArray(mappedItem)) {
      acc = acc.concat(mappedItem);
    } else {
      acc.push(mappedItem);
    }
    return acc;
  }, []);

matthew-gerstman

[
  { name: "Harry Potter", house: "Gryffindor", points: 40 },
  { name: "Hermione Granger", house: "Gryffindor", points: 140 },
  { name: "Draco Malfoy", house: "Slytherin", points: -20 },
  { name: "Lin Manuel Miranda", house: "Slytherin", points: 5000 },
  { name: "Taylor Swift", house: "Slytherin", points: 100 },
  { name: "Cedric Diggory", house: "Hufflepuff", points: 12 },
  { name: "Sally Perks", house: "Hufflepuff", points: 15 },
  { name: "Luna Lovegood", house: "Ravenclaw", points: 100 },
  { name: "Cho Chang", house: "Ravenclaw", points: 100 }

matthew-gerstman

function flatten(list) {
  return list.reduce((acc, item) => {
    if (Array.isArray(item)) {
      acc = acc.concat(item);
    } else {
      acc.push(item);
    }
    return acc;
  }, []);
}

matthew-gerstman

[
  [
    { name: "Harry Potter", house: "Gryffindor", points: 40 },
    { name: "Hermione Granger", house: "Gryffindor", points: 140 },
    { name: "Draco Malfoy", house: "Slytherin", points: -20 }
  ],
  [
    { name: "Lin Manuel Miranda", house: "Slytherin", points: 5000 },
    { name: "Taylor Swift", house: "Slytherin", points: 100 },
    { name: "Cedric Diggory", house: "Hufflepuff", points: 12 }