JAVASCRIPT

Map and Filter methods used together

const list = ['Apple', 'Orange', 'Egg']
list.map(item => item[0]).filter(item => item === 'A') //'A'

map and filter js

var options = [
  { name: 'One', assigned: true }, 
  { name: 'Two', assigned: false }, 
  { name: 'Three', assigned: true }, 
];

var reduced = options.reduce(function(filtered, option) {
  if (option.assigned) {
     var someNewValue = { name: option.name, newProperty: 'Foo' }
     filtered.push(someNewValue);
  }
  return filtered;
}, []);

document.getElementById('output').innerHTML = JSON.stringify(reduced);
<h1>Only assigned options</h1>
<pre id="output"> </pre>

Filter and map an array3

// Only change code below this line
const filteredList = watchList
  .filter(({ imdbRating }) => imdbRating >= 8.0)
  .map(({ Title: title, imdbRating: rating }) => ({ title, rating }));
// Only change code above this line

console.log(filteredList);

Filter and map an array

const filteredList = watchList
  .filter(movie => {
    // return true it will keep the item
    // return false it will reject the item
    return parseFloat(movie.imdbRating) >= 8.0;
  })
  .map(movie => {
    return {
      title: movie.Title,
      rating: movie.imdbRating
    };
  });