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Yakov Fain

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Top Stories by Yakov Fain

Angular 4 comes with some useful changes in the router. Let’s take a look at the changes in receiving parameters by a route and in the CanDeactivate guard (see here). A route can receive the parameters either using a snapshot property of the ActivatedRoute or by subscribing to its property param. Now there is a property paramMap that allows you to either get a particular parameter by using the method get() or get all parameters by invoking getAll(). Here’s how to receive a parameter id that’s not changing in the parent: export class ProductDetailComponentParam { productID: string; constructor(route: ActivatedRoute) { this.productID = route.snapshot.paramMap.get('id'); } } If the parameter id is changing in the parent (as described here), you can subscribe to the stream of id’s as follows: export class ProductDetailComponentParam { productID: string; constructor(rout... (more)

Secrets Of The Masters: Core Java Job Interview Questions

JDJ's Enterprise Editor, Yakov Fain (pictured) writes: If you are planning to hit the job market,  you may need to refresh some of the Java basic terms and techniques to prepare yourself for a technical interview. Let me offer you some of the core Java questions that you might expect during the interviews.  For  most questions  I’ve provided only  short  answers to encourage further research.  I have included only  questions for mid (*) and senior level (**) Java developers. These sample questions could also become handy for people who need to interview Java developers (see also ... (more)

Angular 2: Exposing a Child Component’s API | @CloudExpo #Cloud

In Angular 2 a parent component can pass the data to its child via binding to the child’s input parameter marked with the annotation @Input(). I’ll blog about it later, but you can see how it can be done in my blog on implementing the Mediator design pattern. In this blog I’ll show you another scenario when the parent component simply needs to use the API exposed by the child. You’ll see how a parent component can use the child’s API from both the template and the TypeScript code. Let’s create a simple application where a child component has the method greet() that will be invo... (more)

TypeScript: callable interfaces

TypeScript is a superset of JavaScript and over the last year it’s gaining popularity by leaps and bounds. Angular 2 and RxJS 5 are written in Typescript. I believe about a million of developers are using TypeScript today for app development (this is not official stats). I’m using TypeScript for more than a year and it’s so much more productive than JavaScript! For me (a Java developer), TypeScript makes a lot more sense than JavaScript. But if your main language was JavaScript, some of the TypeScript’s concepts might look foreign for you. I’m planning to write a couple of blog... (more)

SYS-CON Webcast: Eclipse IDE for Students, Useful Eclipse Tips & Tricks

View Yakov Fain's Video Training in Lesson 11 In Lesson 10 of the Java Basics series Yakov Fain shows you how to start working with Eclipse IDE, which is a tool of choice for millions of professional Java programmers. After reading this article you may want to look at another of Yakov's articles for youngsters "Teaching Kids Programming: Even Younger Kids can Learn Java". Moving to Eclipse Programmers usually work in a so-called Integrated Development Environment (IDE). You can write, compile and run programs there. An IDE also has a Help thingy that describes all elements of the ... (more)