docs/30-clean-code/40-objects-and-data-structures.md
---
title: Objects and Data Structures
description: This is a guide to producing readable, reusable, and refactorable software for TypeScript.
---
## Make objects have private/protected members
```ts::Bad
class Circle {
public radius: number
public constructor(radius: number) {
this.radius = radius
}
}
```
```ts::Good
class Circle {
public constructor(private readonly _radius: number) {}
}
```
## Prefix private members with an underscore
```ts::General
class Foo {
private readonly bar: number
private baz(): number {
...
}
}
```
```ts::Our Style
class Foo {
private readonly _bar: number
private _baz(): number {
...
}
}
```