Notify users by mentions

notifyUsersByMentions.js

const _ = require('lodash');

const users = {
    1: {
        id: 1,
        name: "alex",
        teamdIds: [
            10, 20
        ]
    },
    2: {
        id: 2,
        name: "bob",
        teamdIds: [
            20
        ]
    },
}

function notify(userIds, msg) {
  console.log(userIds);
    userIds.forEach(userId => {
        console.log("hello " + users[userId].name + ", " + msg);
    })
}

function getMentions(update) {
    return [
        {
            type: "user",
            id: 1
        },
        {
            type: "team",
            id: 20
        }
    ]
}

function notifyUpdate(update) {
    let mentions = getMentions(update);
    let userIdsToNotify = getUserIdsToNotify(mentions);
    notify(userIdsToNotify, "You were mentioned")
}

function getUserIdsToNotify(mentions) {
    let mappedMentions = mentions.map(mention => {
        if (mention.type === "user") {
            return mention.id;
        }
        if (mention.type === "team") {
            return _.filter(users, user => {
                return user.teamdIds.includes(mention.id);
            }).map(user => user.id);
        }
    })

    return _.uniq(_.flatten(mappedMentions));
}

notifyUpdate()