react-native-console-time-polyfill
Starts a timer you can use to track how long an operation takes. When you call console.timeEnd()/console.timeLog() with the same name, the react-native will output the time, in milliseconds, that elapsed since the timer was started.
Also you can use console.count() and console.countReset() for determine number of function calls.
Installation
Install library from npm
npm install --save react-native-console-time-polyfillor yarn
yarn add react-native-console-time-polyfillSyntax
console.time(label);
console.timeLog(label);
console.timeEnd(label);
console.count(label);
console.countReset(label);Parameters
label
The name to give the new timer or counter. This will identify the timer or counter.
Use the same name when calling console.timeEnd() to stop the timer and get the time output to the console.
Usage
Use the following code:
// in your root javascript file
import 'react-native-console-time-polyfill';
// now you can use polyfill in your components
class Example extends Component {
constructor(props) {
super(props);
console.time(`${this.constructor.name} init`);
// "some slow initializaton code"
console.timeEnd(`${this.constructor.name} init`);
}
componentWillUnmount() {
console.countReset(`${this.constructor.name}.render calls`);
}
render() {
console.count(`${this.constructor.name}.render calls`);
return (
<Text>some text</Text>;
);
}
}Output
Example init: 200ms
Example.render calls: 2