typescript - Kononov Space

typescript

A collection of 11 posts

[RECIPE]: distinct operation for array

[RECIPE]: distinct operation for array

Being web full stack developer after years of .NET work sometimes brings you to a blind alley. For example, such trivial thing as `.distinct()` function for array, which is not present in TS/JS. So, let's find out how to do the same. const data: ItemType[] = [{id: 1}, {id: 1}

[RECIPE]: array flatten and distinct in TS

[RECIPE]: array flatten and distinct in TS

I caught up myself on a thought that I have looked to a way to flatten array in TS several times this year. Probably, I had bad memory and cannot remember this easily. But maybe, it's more because this is not something you do everyday. So, let's keep the recipe

[RECIPE]: Check error throw in jest

[RECIPE]: Check error throw in jest

Jest is something which millions of people uses everyday, a lot of questions are answered. But I keep finding something new for me every day. This is not gonna work: describe('throw test', () => { it('should throw the error', () => { expect(throwingFunc()).toThrow(); }); }); Test will fail with the error you are looking

Runtime Type Safety in Typescript

Runtime Type Safety in Typescript

In many ways Javascript popularity during so many years is based on its relative simplicity and low entry threshold. Some programming languages substantially influenced the whole software industry. Smalltalk, for instance, became some kind of grandpa for object oriented programming, though Smalltalk itself is not used a lot. But Javascript.

[RECIPE]: fix vulnerable sub-dependencies in package.json

[RECIPE]: fix vulnerable sub-dependencies in package.json

Regular Typescript or Javascript project has number of dependencies from NPM. Most of them have own dependencies, different versions of them. To see them all you can review auto generated file package-lock.json. Different versions of some library can be used in range of other libraries. Which can cause dependencies

Mighty @Decorators in Typescript - what could we get out of it?

Mighty @Decorators in Typescript - what could we get out of it?

Every Angular developer has seen decorators in Typescript code. We use it to define Module (hopefully, will not use modules in future but anyway), to configure dependency injection or component properties. In other words, We use it to put some additional information, or metadata, for the compiler. Angular is just

State Management — how we do it with MobX in Mobile App

State Management — how we do it with MobX in Mobile App

Dear readers, this material was inspired by the recently completed React Native project. The project was designed with the offline first approach in mind and we used state management from the very beginning. I will cover state management ideas and principals in this text, as well as usage of MobX

Runtime Type Safety in Typescript (Возможна ли удобная проверка типов в рантайме)

Runtime Type Safety in Typescript (Возможна ли удобная проверка типов в рантайме)

Относительная простота и доступность Javascript, относительная легкость входа в него предопределила на многие годы вперед его популярность. Некоторые языки программирования существенно повлияли на развитие всей отрасли в целом. Так, например SmallTalk стал неким прадедушкой ООП и объектного подхода, хоть сам по себе мало где используется. А Javascript... на мой взгляд

Прикручиваем ngx-translate в Angular приложение. Практическое пошаговое руководство

Прикручиваем ngx-translate в Angular приложение. Практическое пошаговое руководство

Практическая пошаговая инструкция как прикрутить динамическую локализацию (возможность выбора языков) в веб приложении на Angular 4+ используя @ngx-translate/core. В принципе можно найти публикации на подобную тему, может быть достаточно самой документации этой библиотеки, но я хотел систематизировать эту инструкцию для более удобного применения. Такая закладка в копилку начинающего Angular

[RECIPE]: AWS ECS deployment and Health Checks

[RECIPE]: AWS ECS deployment and Health Checks

Recently my regular deployment of NestJS Backend API to Amazon ECS service failed without any meaningful reasons. What I see is that Docker container is taken, everything inside is executed successfully, I see logs of service which has started and even (but why) some requests to my endpoints. Seems like

Talk at ngVikings 2019 conference in Copenhagen

Talk at ngVikings 2019 conference in Copenhagen

Summer 2019 started for from interesting trip to Copenhagen, Denmark. I was lucky to speak at ngVkings conference there. My talk was about Angular and Bad Practices in it. Hope you can enjoy the video the same way as I enjoyed being and talking in this amazing conference! p.s.