how to get full width react-native using dimension code example

Example 1: how to take 100% width in react native

header : {
	height : 100,
  	backgroundColor: "favorite color",
    alignSelf: "stretch",
}

Example 2: react-native how to get size of screen

import { Dimensions } from 'react-native';

dimensions: {
width: Dimensions.get('window').width,
height: Dimensions.get('window').height
}