Small snippets used in web dev testing

average.js

//ex.1: simple array
const average = (array) => {
  const reducer = (sum, item) => {
    return sum + item
  }
  return array.reduce(reducer, 0) / array.length
}
console.log(average([6,3,5,6]))
//output : 5

//ex.2: array with objects
const average2 = array => {
  const reducer = (sum, item) => {
    return sum + item;
  };
  return array.reduce(reducer, 0) / array.length;
};
const rex = [
  { content: 'hi', likes: 6 },
  { content: 'hi', likes: 3 },
  { content: 'hi', likes: 5 },
  { content: 'hi', likes: 6 },
];
console.log(average2(rex.map(note => note.likes)));
//output : 5

palindrome.js

const palindrome = (string) => {
  return string
    .split('')
    .reverse()
    .join('')
}

console.log(palindrome('hey'))
//output : 'yeh'