sandrabosk

The most common ways of iterating over arrays

for loop

Probably the most used way of iterationg through arrays so far:

const names = ["carlos", "ana", "alex"];

for(let i = 0; i < names.length; i++){

sandrabosk

1. allowedToDrink will be the list of people who are older than 21.

const allowedToDrink = people.filter(person =>{
  return person.age >= 21;
});
// in one line:
// const allowedToDrink = people.filter(person => person.age >= 21);
console.log(allowedToDrink);

// [ { name: 'Candice', age: 25 },

sandrabosk

const capsMs = cities1.filter(theCity => theCity[0] === "m")
                      .map(city => {
                        if (city.includes(" ")){
                          let splitted = city.split(" ");
                          const len = splitted.length;
                          for (let i = 0; i < len; i++){
                            splitted[i] = splitted[i][0].toUpperCase() + splitted[i].slice(1);
                          }
 return splitted.join(" ");

sandrabosk

const newArray = numbers.filter(number =>{
  return ((number % 2 ===1)&&(number<100))
});
console.log(newArray); // [ 1, 99, 73 ]

sandrabosk

.reverse()

• mutates the original array so needs to be cloned before applying .reverse() on it
• returns the array of the same size in reversed order

Source

We will be working on the following array:

sandrabosk

VS Code shortcuts

• Search text through all files at once

  • Mac: Command + Shift + f
  • Windows: Ctrl + Shift + f

• Re-open a closed editor When you have multiple open files and accidentally close one or more of them, finding them, and re-opening can be time-consuming and a little frustrating. This is an undo feature exclusively for tabs:

• Mac: Command + Shift + t

sandrabosk

// Example:
// User has an array of references to posts
// Posts have an array of references to comments

// Or Dani's example: https://github.com/webmad-shared/doublepopulate/blob/master/bin/seeds.js

router.get('/posts', (req, res, next) => {
  Model.find()
        .populate('oneProperty') // .populate("creator")
        .populate({

sandrabosk

// example with Alina Z.
Act.find()
        
        .then(allSuggestedActs => {
     
          const user = new User({
            fullName,
            email,
            encryptedPassword,
            score: 0,

sandrabosk

const product = {
  name: "AmazonBasics Apple Certified Lightning to USB Cable",
  price: 7.99,
  manufacter: "Amazon",
  reviews:
  [
    {  user: "Pavel Nedved",
      comments: "It was really usefull, strongly recommended",
      rate: 4
    },

sandrabosk

How to connect local and remote repos?

(will be demonstrated on the example of creating "Katas" folder locally and on the GitHub )

locally (on your laptop)

$ mkdir katas
$ cd katas
$ git init # initialize Git repo