While building up my own library for Telegram Bot API, I’ve run across the need to transmit files via multipart/form-data. Old established libraries like OkHttp or Apache Http Client already has classes for multipart data, but there is nothing like this in Java 11 new http client.

I’ve discovered a decent collection of recipes for Java 11 http client, and then I’ve used it as the foundation for this article.

Thus I choose to rewrite multipart/form-data method in Kotlin and adapt it to my project:

Here is code for Telegram bot, so you could replace token and try it yourself. Probably, it would be easier to adapt my code to your needs:

No, you can’t. I’ve got an example for you:

var a={},
    b={key:'b'},
    c={key:'c'};a[b]=123;
a[c]=456;console.log(a[b]);
console.log(a[c]);

Output of both console.log statements will be 456. To understand why it it so, we should use base Object method toString() on both objects. We will see following output:

> b.toString();
< "[object Object]"
> c.toString();
< "[object Object]"

So when you use object as a key of another object it internally converts to string with value [object Object]. So this is all equal calls:

a[b] === a[c] === a[{}] === a["[object Object]"]

But if you still want to use object as a key, you should use ES6 Maps.

Recently I’ve dived into ECMA-262 (9th Edition / June 2018) specification and in this article I will try to explain variable hoisting using LexicalEnvironment and VariableEnvironment. This article mainly summarise answers to several StackOverflow questions and my understanding of the specification.

The difference between var and let declarations is scoping…

Story about inferential statistics project

This story won’t be a step by step guide to becoming Data Scientist, because I have no idea what should I do after completing following project. So I decide to write a story each time I have some accomplishments on my way.

Something about my…

When I was a student, I’ve got first acquaintance with banking sector and it was awful experience. A lot of software developers sit in narrow open space and they’ve got only one point to access Internet — laptop with mobile wi-fi. I was scared of banks since then.

Several years…

Recently, I’ve encountered interesting task. I should create proxy with apache or nginx for weblogic application. So this article will be about it.

Overall configuration is following:

worker_processes  1;error_log  logs/error.log;  
error_log  logs/error.log  notice;  
error_log  logs/error.log  info;pid        logs/nginx.pid;
events {  
    worker_connections  1024;
}
http {  
    include       mime.types;
    default_type  application/octet-stream;…

While waiting for the project from outsource company, I’ve started to investigate information about Java Play 2 Framework. And it’s really impressive modern tool, which can be used to create amazing web applications. It also has powerful tool to create REST services.

Outsourced application has Angular.js, Gulp, Node.js on front-end…

This is very important question, because it take a lot of time when you met Django for first time. This guide is for setting up Django MEDIA and STATIC files for development environment and it will be more compact then official guide, though I'll give a reference to it.

Configuration of settings.py and urls.py

First…