7.js

function letsRun() {
    console.log("** people **");

    const people = [
        { name: "Wes", year: 1988 },
        { name: "Kait", year: 1986 },
        { name: "Irv", year: 1970 },
        { name: "Lux", year: 2015 },
    ];

    console.table(people);

    console.log("** comments **");

    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 },
    ];

    console.table(comments);

    // some() and every()

    console.log(
        "** Array.prototype.some() ** \n Is at least one person 19 or older?"
    );

    // Method 1
    var isAdult = people.some(function (person) {
        const currentYear = new Date().getFullYear();
        if (currentYear - person.year >= 19) {
            return true;
        } else {
            return false;
        }
    });

    // Method 2
    isAdult = people.some((person) => {
        return new Date().getFullYear() - person.year >= 19;
    });

    console.log(isAdult);
    console.log({ isAdult });

    console.log("** Array.prototype.every() ** \n Is everyone 19 or older?");

    isAdult = people.every((person) => {
        return new Date().getFullYear() - person.year >= 19;
    });

    console.log(isAdult);

    // find()
    console.log(
        "** Array.prototype.find() ** \n 'Find is like filter, but instead returns just the one you are looking for' \n Find the comment with the ID of 823423"
    );

    const comment = comments.find((comment) => {
        return comment.id === 823423;
    });

    console.log(comment);

    // findIndex()
    console.log(
        "** Array.prototype.findIndex() ** \n Find the comment with this ID 823423"
    );

    const index = comments.findIndex((comment) => comment.id === 823423);

    console.log(index);
    console.log("Delete the comment with the ID of 823423");

    // Method 1
    const newComments = [
        ...comments.slice(0, index),
        ...comments.slice(index + 1),
    ];

    console.log({ newComments });

    // Method 2
    comments.splice(index, 1);

    console.table(comments);
}

window.addEventListener("DOMContentLoaded", letsRun);