Day 7: JavaScript Challenge
This exercise focusses on the following Array methods: some(), every(), find() and findIndex().
Didn’t break a sweat with this one :) but ended up learning some useful Array methods!
JS code snippet below:
// ## Array Cardio Day 2
const people = [
{ name: 'Wes', year: 1988 },
{ name: 'Kait', year: 1986 },
{ name: 'Irv', year: 1970 },
{ name: 'Lux', year: 2015 }
];
const comments = [
{ text: 'Love this!', id: 523423 },
{ text: 'Super good', id: 823423 },
{ text: 'You are the best', id: 2039842 },
{ text: 'Ramen is my fav food ever', id: 123523 },
{ text: 'Nice Nice Nice!', id: 542328 }
];
// Some and Every Checks
// Array.prototype.some() // is at least one person 19 or older?
// const isAdult = people.some(function(person) {
// const currentYear = (new Date()).getFullYear();
// if (currentYear - person.year >= 19) {
// return true;
// }
// });
// Better way of doing the above
const isAdult = people.some(person => ( (new Date()).getFullYear())
- person.year >= 19);
console.log({isAdult});
// Array.prototype.every() // is everyone 19 or older?
const allAdults = people.every(person => ((new Date()).getFullYear)
- person.year >= 19);
console.log({allAdults});
// Array.prototype.find()
// Find is like filter, but instead returns just the one you are looking for
// find the comment with the ID of 823423
const findComment = comments.find(comment => comment.id === 823423);
console.log({findComment});
// Array.prototype.findIndex()
// Find the comment with this ID
// delete the comment with the ID of 823423
const index = comments.findIndex(comment => comment.id === 823423);
// commnts.splice(index, 1); // one way of doing it
// another way - builds a new array of comments, using spread operator
const newComments = [
...comments.slice(0, index),
...comments.slice(index + 1)
];
console.log(newComments);