From 71b3bf64c1db6ef80dfc9419b5088093ff0e9f20 Mon Sep 17 00:00:00 2001 From: Travis CI Date: Sat, 10 Oct 2015 23:11:00 +0000 Subject: [PATCH] update website --- docs/javascript-environment.html | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/javascript-environment.html b/docs/javascript-environment.html index 98bf4e4d5b3..798ca87fa0b 100644 --- a/docs/javascript-environment.html +++ b/docs/javascript-environment.html @@ -1,4 +1,4 @@ -JavaScript Environment – React Native | A framework for building native apps using React
React Native

Quick Start

Guides

Guides (iOS)

Guides (Android)

components

apis

Polyfills

JavaScript Environment

JavaScript Runtime #

When using React Native, you're going to be running your JavaScript code in two environments:

  • On iOS simulators and devices, Android emulators and devices React Native uses JavaScriptCore which is the JavaScript engine that powers Safari. On iOS JSC doesn't use JIT due to the absence of writable executable memory in iOS apps.
  • When using Chrome debugging, it runs all the JavaScript code within Chrome itself and communicates with native code via WebSocket. So you are using V8.

While both environments are very similar, you may end up hitting some inconsistencies. We're likely going to experiment with other JS engines in the future, so it's best to avoid relying on specifics of any runtime.

JavaScript Syntax Transformers #

Syntax transformers make writing code more enjoyable by allowing you to use new JavaScript syntax without having to wait for support on all interpreters.

As of version 0.5.0, React Native ships with the Babel JavaScript compiler. Check Babel documentation on its supported transformations for more details.

Here's a full list of React Native's enabled transformations.

ES5

  • Reserved Words: promise.catch(function() { });

ES6

ES7

Next →
© 2015 Facebook Inc.
React Native

Quick Start

Guides

Guides (iOS)

Guides (Android)

components

apis

Polyfills

JavaScript Environment

JavaScript Runtime #

When using React Native, you're going to be running your JavaScript code in two environments:

  • On iOS simulators and devices, Android emulators and devices React Native uses JavaScriptCore which is the JavaScript engine that powers Safari. On iOS JSC doesn't use JIT due to the absence of writable executable memory in iOS apps.
  • When using Chrome debugging, it runs all the JavaScript code within Chrome itself and communicates with native code via WebSocket. So you are using V8.

While both environments are very similar, you may end up hitting some inconsistencies. We're likely going to experiment with other JS engines in the future, so it's best to avoid relying on specifics of any runtime.

JavaScript Syntax Transformers #

Syntax transformers make writing code more enjoyable by allowing you to use new JavaScript syntax without having to wait for support on all interpreters.

As of version 0.5.0, React Native ships with the Babel JavaScript compiler. Check Babel documentation on its supported transformations for more details.

Here's a full list of React Native's enabled transformations.

ES5

  • Reserved Words: promise.catch(function() { });

ES6

ES7

Next →
© 2015 Facebook Inc.