Day 7: JavaScript Challenge Dec 13, 2019 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! Repo here and demo is here. 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);