asduser

CREATE DATABASE IF NOT EXISTS mydb;

use mydb;

asduser

MongoClient.connect('mongodb://admin:pass@localhost:27017/mydb?authSource=admin').then((db) => {
    return db.command({ 
        grantRolesToUser: 'user',
        roles: ['dbAdmin', 'readWrite']
    })
    .then((stat) => {
        console.log(stat);
    });
})
.catch(console.log);

asduser

class User {

    public name: string;
    public age: number;
    public languages: string[];

    constructor(name:string);
    constructor(name:string, age?: number);
    constructor(name:string, age: number, languages?: string[])
    constructor(name?:string, age?: number, languages?: string[]) {

asduser

var mainContainer = $("#main");
var loader = $(".load-bar");

mainContainer.imagesLoaded()
    .always( function( instance ) {
        console.log('all images loaded');
        toggleElements();
    })
    .done( function( instance ) {
        console.log('all images successfully loaded');

asduser

Ajax/http requests boilerplate.

1. http-requests.
2. mocked json-data.
3. tricks to manage api.
4. handlers, dispatchers etc.

asduser

The code below assumes that each item should has two attributes: unique id and value field. Due to boolean comparison operator we can get an appropriate element.

Next item algorithm.

1. Check if current index in iteration is not equal to collection.length, otherwise - specify index to 0.
2. Increase current index by 1.
3. Check if current element has value. If not - do 2nd step, if yes - return it and break loop.

Previous item algorithm.

asduser

let divide = (num: number, divider: number = 10) => {
    return new Promise<any>((resolve, reject) => {
        resolve(num / divider);
    });
};
let collection: number[] = [30, 40, 50];

Promise.all(collection.map((n) => {
    return divide(n);
})).then((res: number[]) => {

asduser

let combine = (num: number, combiner: number = num) => {
    return new Promise<any>((resolve, reject) => {
        resolve(num + combiner);
    });
};

let multiple = (num: number, multiplier: number = num) => {
    return new Promise<any>((resolve, reject) => {
        resolve(num * multiplier);
    });

asduser

function copySync(src, dest) {
    if (!fs.existsSync(src)) return false;
    var data = fs.readFileSync(src, 'utf-8');
    fs.writeFileSync(dest, data);
}

function replaceInFile(src, replaceKey){
    fs.readFile(src, 'utf8', function (err, data) {
        if (err) return console.log(err);
        console.log(data);

asduser

const loadDataOrDefault = <T>(response: any, defInstance?: T) => {
    try {
        return JSON.parse(response);
    } catch(e) {
        return defInstance ? defInstance : null;
    }
};

class Person {
    constructor(public name: string = "Default", public age: number = 100) {}