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Learning React.js Scalable & High-Perf Apps : Enhancing Perf wth let & const in ES6 | packtpub.com

93 views · Published 16 February 2017 · 12:31 · Indexed 14 November 2026

Channel: Packt · 2017 · Science & Technology

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One of the bigger performance eaters are variables. To address this problem ES6 added two main new ways into JavaScript to work with variables so you can use them instead of vars. In this video, we will understand when to use let and const and where to place them in our React components. 
• Take a look at why variables are performance killers
• Know the importance of scope
• Learn about the importance of changeability



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