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Modern JavaScript in React Documentation

If you haven’t worked with JavaScript in the last few years, these three points should give you enough knowledge to feel comfortable reading the React documentation:

  • We define variables with let and const statements. For the purposes of the React documentation, you can consider them equivalent to var.
  • We use the class keyword to define JavaScript classes. There are two things worth remembering about them. Firstly, unlike with objects, you don't need to put commas between class method definitions. Secondly, unlike many other languages with classes, in JavaScript the value of this in a method depends on how it is called.
  • We sometimes use => to define "arrow functions". They're like regular functions, but shorter. For example, x => x * 2 is roughly equivalent to function(x) { return x * 2; }. Importantly, arrow functions don't have their own this value so they're handy when you want to preserve the this value from an outer method definition.

Don't worry if this is too much to take in at once. The MDN JavaScript Reference is a stellar resource, and you can consult it whenever you get confused by something.

Also, when you feel unsure about what some newer syntax means, you can use the Babel REPL with the ES2015 preset to check what equivalent older syntax it compiles to.

@callseven
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Helpful thanks!

@sodexx7
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sodexx7 commented Aug 4, 2022

Thanks your shares.

@Murat88
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Murat88 commented Aug 8, 2022

thank you !

@chienhsiang-hung
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thank you

@Derrick-Tai
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Thank you very much!

@felixtemikotan
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Thank you. This proves to be very informative.

@TUCCHI1
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TUCCHI1 commented Aug 18, 2022

thanks

@moooza
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moooza commented Aug 28, 2022

thank you

@chlxdb
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chlxdb commented Aug 29, 2022

Thanks!!

@napalfacundo
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Thank you, helpful!

@ask-traceroute
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ありがとう

@Gameonn
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Gameonn commented Sep 6, 2022

@gaearon hello the last link is broken: Babel REPL with the ES2015 preset image

Try out this link for Babel REPL with the ES2015 preset, it worked for me.

@Coderamrin
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a very brief intro to ES6. thanks fro this simplest tutorial.

@huynhit24
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Good!

@Basar1985
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Nice project

@nabhsing
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nabhsing commented Oct 6, 2022

Thank you!

@Indiphile
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Thank you!!!

@fritzjackhunt
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Thanks!!

@Mensonb
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Mensonb commented Oct 25, 2022

thanks

@TalmageBird
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thanks

@azimchamran
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thank you! It was helpful

@Haticeors
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thanks your shares !

@Bert-King
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thanks,it's save my time

@bigqz
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bigqz commented Dec 13, 2022

six six six

@shaikh-smr
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this was Helpfull to me thank you one more time ....

@SINAZZzz
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Thank you

@iamsaqib24
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this was helpful, thanks for sharing.

@Hajar-khaldi
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Hajar-khaldi commented Jan 2, 2023

Thank you for the informations, people who can't access to the link, try this one : https://babeljs.io/repl

@Slane-tm
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thanks

@Lewis-Peter
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Thanks

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