This is destructuring assignment. It is a new feature of ECMAScript 2015.

var {
  AppRegistry,
  StyleSheet,
  Text,
  View,
} = React;

Equivalent to:

var AppRegistry = React.AppRegistry;
var StyleSheet = React.StyleSheet;
var Text = React.Text;
var View = React.View;

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It is called Destructuring assignment and is part of the ES2015 standard .

Object destructuring

var o = {p: 42, q: true};
 var {p, q} = o;

 console.log(p); // 42
 console.log(q); // true 

 // 分配新的变量名
 var {p: foo, q: bar} = o;

 console.log(foo); // 42
 console.log(bar); // true

Array destructuring

var foo = ["one", "two", "three"];

// 不使用解构
var one   = foo[0];
var two   = foo[1];
var three = foo[2];

// 使用解构
var [one, two, three] = foo;

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