RxSwift: read-only property and read-write property wrapper

BehaviorRelay and RxProperty

Any Swift developer who worked with RxSwift knows that Observables and Subjects lack the ability to store the last value. Before RxSwift 5.0.0 there was the _Variable _generic class for this purpose, now it has been substituted with the BehaviorRelay which technically is not even part of RxSwift, but RxRelay module.

A developer who just starting to use RxSwift may be confused, what’s the difference between PublishSubject, BehaviorSubject, PublishRelay, and BehaviorRelay.

• Publish vs _Behavior. _The first doesn’t store the last value, while the last - does.
• Subject vs Relay. The last doesn’t through an error and can’t be terminated, while the first - can.

As you may already know, RxSwift is used to glue components in the app: a ViewModel with a ViewController in MVVM, an Interactor with Services in RIBs, a Middleware with a Store in Redux.

Normally, a _PublishSubject _is used to propagate an event, while BehaviorRelay to share some value or a state. The common interface for a ViewModel looks like:

There is a slight problem with this ViewModel declaration though: its state is modifiable outside. Because even it is only a get property, ._accept()_method, which modifies the value, is available. This totally breaks one of the fundamental rules of OOP - encapsulation.

Someone may propose to use Observable in the protocol instead of BehaviorRelay, i.e. something like that:

#mvvm #rxswift #ios-app-development #ios #property-wrapper

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RxSwift: read-only property and read-write property wrapper

BehaviorRelay and RxProperty

Any Swift developer who worked with RxSwift knows that Observables and Subjects lack the ability to store the last value. Before RxSwift 5.0.0 there was the _Variable _generic class for this purpose, now it has been substituted with the BehaviorRelay which technically is not even part of RxSwift, but RxRelay module.

A developer who just starting to use RxSwift may be confused, what’s the difference between PublishSubject, BehaviorSubject, PublishRelay, and BehaviorRelay.

• Publish vs _Behavior. _The first doesn’t store the last value, while the last - does.
• Subject vs Relay. The last doesn’t through an error and can’t be terminated, while the first - can.

As you may already know, RxSwift is used to glue components in the app: a ViewModel with a ViewController in MVVM, an Interactor with Services in RIBs, a Middleware with a Store in Redux.

Normally, a _PublishSubject _is used to propagate an event, while BehaviorRelay to share some value or a state. The common interface for a ViewModel looks like:

There is a slight problem with this ViewModel declaration though: its state is modifiable outside. Because even it is only a get property, ._accept()_method, which modifies the value, is available. This totally breaks one of the fundamental rules of OOP - encapsulation.

Someone may propose to use Observable in the protocol instead of BehaviorRelay, i.e. something like that:

#mvvm #rxswift #ios-app-development #ios #property-wrapper

Reading and Writing to Files in Python - Intermediate Python Tutorial #2

In this Python tutorial, we will learn how to deal with text files in Python using the built-in open function. You will understand how to use the most important modes: read, write and append.
That’s not all! We will discuss about file parsing and touch important string methods used for that such as: strip( ) and split( ). Finally we wrap up with a parsing file exercise to practice the new concepts. After that video you will be confident to deal with text files which is a very important skill to have as a programmer.

Playlist: Intermediate Python Tutorials | Video #2
Access the codes here: https://github.com/rscorrea1/youtube.git

Timestamp:
00:00 - Summary of the video
00:17 - Types of files
00:43 - How to open a file
01:17 - File modes
02:15 - How to read data from a file
03:00 - with statement
04:10 - readlines( ) method
05:05 - String: strip( ) method
06:22 - How to iterate over a file line by lin
08:47 - How to write data to a file
11:43 - How to append data to a file
12:37 - Exercise: Parsing a text file
16:14 - Converting data types
17:00 - Next video announcement

Thumbnail:
Photo by Mario Ho on Unsplash

#reading #writing #python #intermediate python tutorial #reading and writing to files in python

What You Can Learn about Setting from Classic Sitcoms

Giving your novel a strong sense of place is vital to doing your part to engage the readers without confusing or frustrating them. Setting is a big part of this (though not the whole enchilada — there is also social context and historic period), and I often find writing students and consulting clients erring on one of two extremes.

**Either: **Every scene is set in a different, elaborately-described place from the last. This leads to confusion (and possibly exhaustion and impatience) for the reader, because they have no sense of what they need to actually pay attention to for later and what’s just…there. Are the details of that forest in chapter 2 important? Will I ever be back in this castle again? Is there a reason for this character to be in this particular room versus the one she was in the last time I saw her? Who knows!

Or: There are few or no clues at all as to where the characters are in a scene. What’s in the room? Are they even in a room? Are there other people in th — ope, yes, there are, someone just materialized, what is happening? This all leads to the dreaded “brains in jars” syndrome. That is, characters are only their thoughts and words, with no grounding in the space-time continuum. No one seems to be in a place, in a body, at a time of day.

Everything aspect of writing a novel comes with its difficulties, and there are a lot of moving pieces to manage and deploy in the right balance. When you’re a newer writer, especially, there’s something to be said for keeping things simple until you have a handle on how to manage the arc and scope of a novel-length work. And whether you tend to overdo settings or underdo them, you can learn something from TV, especially classic sitcoms.

Your basic “live studio audience” sitcoms are performed and filmed on sets built inside studios vs. on location. This helps keep production expenses in check and helps the viewer feel at home — there’s a reliable and familiar container to hold the story of any given episode. The writers on the show don’t have to reinvent the wheel with every script.

Often, a show will have no more than two or three basic sets that are used episode to episode, and then a few other easily-understood sets (characters’ workplaces, restaurants, streets scenes) are also used regularly but not every episode.

#creative-writing #writing-exercise #writing-craft #writing #writing-tips #machine learning

Kotlin Properties - Read/Write Properties from/to .properties/.XML File - ozenero

https://ozenero.com/kotlin-properties-read-write-properties-file-properties-xml-file

Kotlin Properties – Read/Write Properties from/to .properties/.XML File

In the post, we show how to Read/Write Properties from/to .Properties/.XML files by Kotlin language.

I. Kotlin - Read/Write Properties from/to .Properties file

1. Write Properties to .Properties file

1.1 Properties store() method

We use java.util.Properties.store() methods:

// 1.
fun store(out: OutputStream, comments: String): Unit

-> Writes this property list (key and element pairs) in this Properties table 
to the output stream in a format suitable for loading into a Properties table using the load(InputStream) method.

// 2.
fun store(writer: Writer, comments: String): Unit

-> Writes this property list (key and element pairs) in this Properties table 
to the output character stream in a format suitable for using the load(Reader) method.

1.2 Kotlin Program – write Properties to .properties file

More at:

https://ozenero.com/kotlin-properties-read-write-properties-file-properties-xml-file

Kotlin Properties – Read/Write Properties from/to .properties/.XML File

#kotlin #xml #read-file #write-file

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