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schangxiang@126.com

2025-09-19 18966e02fb573c7e2bb0c6426ed792b38b910940

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# to-fast-properties [![Build Status](https://travis-ci.org/sindresorhus/to-fast-properties.svg?branch=master)](https://travis-ci.org/sindresorhus/to-fast-properties)
 
> Force V8 to use fast properties for an object
 
[Read more.](http://stackoverflow.com/questions/24987896/)
 
Use `%HasFastProperties(object)` and `--allow-natives-syntax` to check whether an object already has fast properties.
 
 
## Install
 
```
$ npm install --save to-fast-properties
```
 
 
## Usage
 
```js
const toFastProperties = require('to-fast-properties');
 
const obj = {
    foo: true,
    bar: true
};
 
delete obj.foo;
// `obj` now has slow properties
 
toFastProperties(obj);
// `obj` now has fast properties
```
 
 
## License
 
MIT © Petka Antonov, Sindre Sorhus