Fern  Wisozk

Fern Wisozk

1613792700

Optional Chaining vs Assertion Operator in TypeScript

If you have been using TypeScript, chances are you have come across the weird “?.” & “!” operators while writing code. And if you are like me, then you might have pulled your hair out trying to figure out the difference between them. Well, rest assured because after reading this article, you will have a clear picture of the two operators and the difference between them.

Before we jump to the difference between these two, let us first understand the behavior of these operators.

1. (?.) — Optional Chaining

Before we jump in to understand optional chaining, let’s take a look at this code written in JavaScript.

Image for post

JavaScript Example

In the above code, let’s say we have a data variable but we are not aware of its contents. It may be a null valueundefined, or it may have some properties. To return “data.getName()”, we first have to check whether data is not null and not undefined . Not performing this check may result in an error if the data variable is undefined or null.

Typescript makes writing code like this easy and much simpler to read. With optional chaining, the above code can be re-written in TypeScript as:

Image for post

TypeScript Example

Wasn’t that concise and clean? The star of the show in optional chaining is the "?.” operator that checks if the variable is either null or undefined.

If the "?.” operator finds that the variable is either null or undefined, TypeScript will immediately stop running the expression.

#reactjs #typescript #javascript

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Optional Chaining vs Assertion Operator in TypeScript
Ray  Patel

Ray Patel

1619565060

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

Samanta  Moore

Samanta Moore

1623861240

What is Assertion in Java? How to use Assertion in Java

Table of Contents

What is Assertion in Java?

The assertion in Java is used to ensure the correctness of any program’s assumptions as the assertion is assumed to be true when it is executed. The Java Virtual Machine throws an error named AssertionError if the assertion is false. The assertion in Java has found its application mainly for testing purposes. Boolean expressions are used along with assertion statements. An assertion is a statement, and the ‘asset’ keyword is used to carry out an assertion in Java.

#full stack development #assertion in java #assertion in java #assertion in java #what is assertion in java #how to use assertion in java

Fern  Wisozk

Fern Wisozk

1613792700

Optional Chaining vs Assertion Operator in TypeScript

If you have been using TypeScript, chances are you have come across the weird “?.” & “!” operators while writing code. And if you are like me, then you might have pulled your hair out trying to figure out the difference between them. Well, rest assured because after reading this article, you will have a clear picture of the two operators and the difference between them.

Before we jump to the difference between these two, let us first understand the behavior of these operators.

1. (?.) — Optional Chaining

Before we jump in to understand optional chaining, let’s take a look at this code written in JavaScript.

Image for post

JavaScript Example

In the above code, let’s say we have a data variable but we are not aware of its contents. It may be a null valueundefined, or it may have some properties. To return “data.getName()”, we first have to check whether data is not null and not undefined . Not performing this check may result in an error if the data variable is undefined or null.

Typescript makes writing code like this easy and much simpler to read. With optional chaining, the above code can be re-written in TypeScript as:

Image for post

TypeScript Example

Wasn’t that concise and clean? The star of the show in optional chaining is the "?.” operator that checks if the variable is either null or undefined.

If the "?.” operator finds that the variable is either null or undefined, TypeScript will immediately stop running the expression.

#reactjs #typescript #javascript

Autumn  Blick

Autumn Blick

1598839687

How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

In the article, we discuss the similarities between native mobile development and development using React Native. We also touch upon where they differ and how to bridge the gaps. Read on.

A brief introduction to React Native

Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

React Native is a popular JavaScript framework that Facebook has created. You can use this open-source framework to code natively rendering Android and iOS mobile apps. You can use it to develop web apps too.

Facebook has developed React Native based on React, its JavaScript library. The first release of React Native came in March 2015. At the time of writing this article, the latest stable release of React Native is 0.62.0, and it was released in March 2020.

Although relatively new, React Native has acquired a high degree of popularity. The “Stack Overflow Developer Survey 2019” report identifies it as the 8th most loved framework. Facebook, Walmart, and Bloomberg are some of the top companies that use React Native.

The popularity of React Native comes from its advantages. Some of its advantages are as follows:

  • Performance: It delivers optimal performance.
  • Cross-platform development: You can develop both Android and iOS apps with it. The reuse of code expedites development and reduces costs.
  • UI design: React Native enables you to design simple and responsive UI for your mobile app.
  • 3rd party plugins: This framework supports 3rd party plugins.
  • Developer community: A vibrant community of developers support React Native.

Why React Native is fundamentally different from earlier hybrid frameworks

Are you wondering whether React Native is just another of those hybrid frameworks like Ionic or Cordova? It’s not! React Native is fundamentally different from these earlier hybrid frameworks.

React Native is very close to native. Consider the following aspects as described on the React Native website:

  • Access to many native platforms features: The primitives of React Native render to native platform UI. This means that your React Native app will use many native platform APIs as native apps would do.
  • Near-native user experience: React Native provides several native components, and these are platform agnostic.
  • The ease of accessing native APIs: React Native uses a declarative UI paradigm. This enables React Native to interact easily with native platform APIs since React Native wraps existing native code.

Due to these factors, React Native offers many more advantages compared to those earlier hybrid frameworks. We now review them.

#android app #frontend #ios app #mobile app development #benefits of react native #is react native good for mobile app development #native vs #pros and cons of react native #react mobile development #react native development #react native experience #react native framework #react native ios vs android #react native pros and cons #react native vs android #react native vs native #react native vs native performance #react vs native #why react native #why use react native

PWA vs Native App: Which Is Better Option In 2021?

Every year, the world is expanding with the launch of new smartphones and other gadgets available in the market. According to Statista, more than 50% of the population will be using smartphones by the end of 2021.

Hence, businesses worldwide have understood the importance of smartphones and are joining the mobile industry by launching native apps.

Apart from native apps, progressive web apps is another technology that is gaining a lot of attention among businesses. Moreover, various leading companies worldwide have openly accepted PWA and built progressive web apps.

Now, the question arises, how is PWA different from the native apps? Read More

#pwa vs native #pwa vs native app #progressive web app vs native #progressive web app vs native app #pwa vs native app performance