patrickxrivera

// Bad

const nums = [1, 2, 3, 4, 5];

let doubledNums = [];

for (let i = 0; i < nums.length; i++) {
  doubledNums.push(nums[i] * 2); 
}
     

patrickxrivera

/*

==== Levels of Abstraction ====

- show latest tweet
  - get latest tweet
    - make API request for all tweets and convert to JSON
    - pluck the latest tweet
    - send response
  - update database

patrickxrivera

// Bad

function showLatestTweet() {
  const latestTweet = fetch('http://api.twitter.com/tweets/123')
    .then((response) => response.json())
    .then((tweetsJson) => tweetsJson.tweets[0])
    .catch((err) => {
      console.error('Error retrieving tweets. Please try again');
    });
  

patrickxrivera

// Bad

const salary = 80000 * (1 - (0.20 + 0.10));

const signingBonus = 1000 * (1 - (0.20 + 0.10));

const yearlyBonus = salary * (1 - (0.20 + 0.10));

// Good

patrickxrivera

// Bad

const salary = 80000 * 0.20;

const signingBonus = 1000 * 0.20;

const yearlyBonus = salary * 0.05 * 0.20;

// Good

patrickxrivera

Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

patrickxrivera

const addTo = (cache) => (num) => {
  cache[num] = true;
} 

const smallestPositive = (nums) => {
  let cache = [];

  nums.forEach(addTo(cache));
  
  for (let i = 1; i < cache.length; i++) {

patrickxrivera

const peek = (stack) => stack[stack.length - 1];

const isValidParentheses = (str) => {
  const stack = [];
  const closingPairs = {
    ']': '[',
    '}': '{',
    ')': '('
  }

patrickxrivera

const recursiveFactorial = (n) => n === 1 ? 1 : n * recursiveFactorial(n - 1);

const iterativeFactorial = (n) => {
  let result = 1;

  for (let i = 2; i <= n; i++) {
    result *= i;
  }

  return result;

patrickxrivera

const reduceString = (str, targetChar) => {
  for (let i = str.length - 1; i >= 0; i--) {
    if (str[i] !== targetChar) continue;

    i--;

    while (str[i] === targetChar) {
      str = str.slice(0, i) + str.slice(i + 1);
      i--;
    }