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Aleksandar.B aleksandar-b

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@aleksandar-b
aleksandar-b / electronics.sql
Created May 8, 2023 16:43
SQL Query: Electronics
SELECT
u.name AS user_name,
u.email AS user_email,
SUM(o.quantity * p.price) AS total_spent
FROM
users u
JOIN
orders o ON u.id = o.user_id
JOIN
products p ON o.product_id = p.id
@aleksandar-b
aleksandar-b / proposal-value-objects.js
Last active April 28, 2022 09:45
//Value objects
//Motivation
//Use cases
//Proposed syntax
value Money {
constructor(amount, currency) {
@aleksandar-b
aleksandar-b / events_pattern_matching.js
Last active April 1, 2022 11:58
// cause => effect
user()
.correlationId('userId')
.stateOfAffairs(UserHasRegistered).causes(KycVerified)
.stateOfAffairs(UserHasRegistered,KycVerified).causes(AccountCreated)
.stateOfAffairs(UserHasRegistered,KycVerified,AccountCreated).causes(UserHasTopUp)
.stateOfAffairs(UserHasRegistered,KycVerified,AccountCreated,UserHasTopUp).causes(CreditCardCreated)
.stateOfAffairs(UserHasRegistered,KycVerified,AccountCreated,UserHasTopUp,CreditCardCreated).causes(OnboardFinished)
@aleksandar-b
aleksandar-b / NestInterceptor.ts
Last active March 24, 2022 06:13
Interceptor wrapper for NestJs
import {
CallHandler,
ExecutionContext,
Injectable,
Logger,
NestInterceptor,
} from "@nestjs/common";
import { Observable } from "rxjs";
import { catchError, tap } from "rxjs/operators";
import { isFunction } from "../utils";
@aleksandar-b
aleksandar-b / Filter with recursion.js
Last active January 18, 2020 10:43
const filter = ([head, ...rest] = [], callback) => {
if(!head) return [];
return [
...callback(head) ? [head] : [],
...filter(rest, callback)
];
@aleksandar-b
aleksandar-b / past-tense.js
Created August 19, 2019 08:29 — forked from letsgetrandy/past-tense.js
// language exceptions
var exceptions = {
"are": "were",
"eat": "ate",
"go": "went",
"have": "had",
"inherit": "inherited",
"is": "was",
"run": "ran",
"sit": "sat",
@aleksandar-b
aleksandar-b / composingPromisesErlangStyle.js
Last active June 29, 2019 13:22
import { should, each, iff, prop, props } from 'rvl-pipe'
import { createUser, createAuthToken, authTokenValidator, requestValidator } from '../account'
import ctx from './dummyContext'
const registerUser = each(
validateRequest(requestValidator),
generatePasswordHash(prop('body.password'), 'passwordHash'),
createDocument('users', createUser, "userAccount"),
should(prop('userAccount'), 'invalidUser'),
createJsonWebToken(createAuthToken),
@aleksandar-b
aleksandar-b / undraw.json
Created November 24, 2018 17:26
["https://42f2671d685f51e10fc6-b9fcecea3e50b3b59bdc28dead054ebc.ssl.cf5.rackcdn.com/illustrations/recording_lywr.svg","https://42f2671d685f51e10fc6-b9fcecea3e50b3b59bdc28dead054ebc.ssl.cf5.rackcdn.com/illustrations/gifts_btw0.svg","https://42f2671d685f51e10fc6-b9fcecea3e50b3b59bdc28dead054ebc.ssl.cf5.rackcdn.com/illustrations/booking_33fn.svg","https://42f2671d685f51e10fc6-b9fcecea3e50b3b59bdc28dead054ebc.ssl.cf5.rackcdn.com/illustrations/youtube_tutorial_2gn3.svg","https://42f2671d685f51e10fc6-b9fcecea3e50b3b59bdc28dead054ebc.ssl.cf5.rackcdn.com/illustrations/logistics_x4dc.svg","https://42f2671d685f51e10fc6-b9fcecea3e50b3b59bdc28dead054ebc.ssl.cf5.rackcdn.com/illustrations/teddy_bear_hns1.svg","https://42f2671d685f51e10fc6-b9fcecea3e50b3b59bdc28dead054ebc.ssl.cf5.rackcdn.com/illustrations/email_campaign_qa8y.svg","https://42f2671d685f51e10fc6-b9fcecea3e50b3b59bdc28dead054ebc.ssl.cf5.rackcdn.com/illustrations/vehicle_sale_v7fm.svg","https://42f2671d685f51e10fc6-b9fcecea3e50b3b59bdc28dead054ebc.ssl.cf5.rackcd
@aleksandar-b
aleksandar-b / .block
Created March 15, 2018 17:55
Animated Donut Chart with Percentage
license: gpl-3.0
@aleksandar-b
aleksandar-b / .block
Created February 6, 2018 14:37 — forked from akbstone/.block
Closest Point on Path
license: gpl-3.0