tomaszgil

const data = {
  other: 'skip',
  prefix1: 'take1',
  prefix2: 'take2',
};

const prefixedValues = Object.entries(data)
  // Get only entries with keys staring with prefix
  .filter(([key, value]) => key.startsWith('prefix'))
  // Get only values

tomaszgil

import React, { useRef, useState, useLayoutEffect, useCallback } from "react";

/*
 * Copyright 2020 Adobe. All rights reserved.
 * This file is licensed to you under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. You may obtain a copy
 * of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under
 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS

tomaszgil

function simpleIterator() {
    const iterator = {
        next() {
            return {
                value: "Hello, I'm an iterator",
                done: true,
            };
        },
    };

tomaszgil

const startTimestamp = getMiliseconds();

function getMiliseconds() {
    return new Date(Date.now()).getMilliseconds();
}

function getMillisecondsElapsed() {
    return getMiliseconds() - startTimestamp;
}