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React News Thursday, May 24

React, Inline Functions, and Performance – componentDidBlog

  • You can see real performance improvements by understanding two things: shouldComponentUpdate and JavaScript strict equality comparisons.
  • So anyway, strict equality checks on objects, even with seemingly similar values, will evaluate to false: – So, if you inline an object in your JSX, it will fail the PureComponent prop diff and move on to diffing the more expensive React elements.
  • Since functions are objects and PureComponent does a strict equality check on props, an inline function will always fail the prop diff and move on to the element diff in the reconciler.
  • Id like to show that you can have inline functions and performance optimizations both at the same time.
  • If a component usually changes when theres an update, then a PureComponent will be doing two diffs instead of just one (props and state in shouldComponentUpdate, and then the normal element diff).

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React, Inline Functions, and Performance – componentDidBlog

ES2018 Regular Expression Updates – an Opinionated Summary

  • Given that I happened to launch a book on Regular Expressions containing a JavaScript Regex video bundle update, I thought about publishing an article on the ES2018 updates on Regular Expressions.
  • The character is not included in the match: – – The negative lookbehind assertion matches the character in a string in case the character before is not an : – – You can see in both solutions that no capture groups were created.
  • In order to capture the value of a lookbehind in a capture group, you can add parentheses around the expression you want to capture: – – In this expression, the resulting regex match object contains the captured character under the index .
  • Suppose we would like to retrieve the currency, the numeric price value, and the full price with currency in a string of format: – – The regular expression matching this string is the following: – – We have to escape the dollar sign as a currency, because is a metasyntax…
  • The documentation details how you can match certain unicode character groups with some expressions, without the use of any third party libraries.

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ES2018 Regular Expression Updates – an Opinionated Summary

Why ReactJS Is More in Demand

  • As stated already, the most compelling feature of React is that it reduces the complexities of user interface.
  • If the mechanism that we are trying to interface can comprehend Javascript, we can use React to build the user interface for it.
  • You describe the user interfaces in React languages and tell it what you want, it will take care to translate your description and prepare the actual interface.
  • You will illustrate user interfaces to React with simple components.
  • When state of a component changes, its User Interface will change automatically.

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Why ReactJS Is More in Demand

React Native vs Real Native Apps – codeburst

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React Native vs Real Native Apps – codeburst

Freebie Bot Daily

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Freebie Bot Daily

Top React Courses

Modern React with Redux (86,762 students enrolled)

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React Native: Advanced Concepts (16,058 students enrolled)

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React JS and Redux - Mastering Web Apps (54,299 students enrolled)

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GraphQL with React: The Complete Developers Guide (14,683 students enrolled)

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Essentials in JavaScript ES6 - A Fun and Clear Introduction (40,155 students enrolled)

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