RxJS Lessons: Understanding Multicasting Operators

Multicasting is not as hard as it may seem.

Introduction

When it comes to RxJS, multicasting is probably one of the most daunting features. Multicasting requires an existing RxJS knowledge base and is, in itself, an aspect that some programmers struggle to grasp. To this, we add that there are quite a few multicasting operators and that knowing which one to pick can prove difficult if we don’t understand how they each work, and which particular problem they solve.

This is an introductory guide to the RxJS multicasting operators. By the end of this guide, you’ll (hopefully) understand these operators a little better, and know when and why you need to use each one. We will start by taking a look at the hot/cold Observable concept, and we’ll then make our way through all of the multicasting operators, discussing their particularities and looking at examples, until we understand them all.

I’ve created a StackBlitz project for each and every one of the examples that we’ll see in this guide, so that you can play around with the code snippets, since, in my humble opinion, this considerably helps to understand how the operators work. You can find the link to the corresponding StackBlitz project in the caption below each example.

Before we get started, here is a list of all the operators that we’ll cover today:

• multicast
• publish
• publishReplay
• publishLast
• publishBehavior
• refCount
• share
• shareReplay

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Ternary operator in Python?

1. Ternary Operator in Python

What is a ternary operator: The ternary operator is a conditional expression that means this is a comparison operator and results come on a true or false condition and it is the shortest way to writing an if-else statement. It is a condition in a single line replacing the multiline if-else code.

syntax : condition ? value_if_true : value_if_false

condition: A boolean expression evaluates true or false

value_if_true: a value to be assigned if the expression is evaluated to true.

value_if_false: A value to be assigned if the expression is evaluated to false.

How to use ternary operator in python here are some examples of Python ternary operator if-else.

Brief description of examples we have to take two variables a and b. The value of a is 10 and b is 20. find the minimum number using a ternary operator with one line of code. ( **min = a if a < b else b ) **. if a less than b then print a otherwise print b and second examples are the same as first and the third example is check number is even or odd.

#python #python ternary operator #ternary operator #ternary operator in if-else #ternary operator in python #ternary operator with dict #ternary operator with lambda

RxJS. Transformation Operators in Examples (part 1)

Operators are functions. There are two kinds of operators:
Pipeable Operators are the kind that can be piped to Observables using the syntax observable$.pipe(someOperator()). When called, they do not change the existing Observable instance, instead, they return a new Observable, whose subscription logic is based on the first Observable.
“A Pipeable Operator is a function that takes an Observable as its input and returns another Observable. It is a pure operation: the previous Observable stays unmodified"

#asynchronous #rxjs #transformation-operators #operators #buffer #java

Unformatted input/output operations In C++

In this article, we will discuss the unformatted Input/Output operations In C++. Using objects cin and cout for the input and the output of data of various types is possible because of overloading of operator >> and << to recognize all the basic C++ types. The operator >> is overloaded in the istream class and operator << is overloaded in the ostream class.

The general format for reading data from the keyboard:

cin >> var1 >> var2 >> …. >> var_n;

• Here, var1, var2, ……, varn are the variable names that are declared already.
• The input data must be separated by white space characters and the data type of user input must be similar to the data types of the variables which are declared in the program.
• The operator >> reads the data character by character and assigns it to the indicated location.
• Reading of variables terminates when white space occurs or character type occurs that does not match the destination type.

#c++ #c++ programs #c++-operator overloading #cpp-input-output #cpp-operator #cpp-operator-overloading #operators

Real-Life Analog of RxJs ZIP Operator

In this video, we continue to look for real-life analogs for #rxjs operators, and today we are going to look at the ZIP operator. This operator allows you to combine multiple streams together and emit an array of values arrived from combined streams. Additionally, this operator cares about the order of how values should be paired (it is hard to explain it with text - better one time to see). I hope you will find this video useful. Stay tuned and enjoy watching!

🕒 Time Codes:
00:00:00 - Intro;
00:00:39 - Mental model for ZIP operator;
00:02:56 - Let's code it!;
00:13:20 - Outro;

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RxJS. Transformation Operators in Examples (part 2)

All you need to know about map, mapTo, mergeMap, mergeMapTo, scan, mergeScan, groupBy, pairwise, partition, pluck, switchMap , switchMapTo, window, windowCount, windowTime, windowToggle, andwindowWhen RxJS Transformation operators in examples (part 2).

#operators #transformation #rxjs #async #asynchronous