docs/30-clean-code/17-quality.md
---
title: Quality
description: This is a guide to producing readable, reusable, and refactorable software for TypeScript.
---
## Achieve exactly what is being requested
Display 'Hello, World!'
```ts::Bad
console.log('Hello world!')
```
```ts::Good
console.log('Hello, World!')
```
## Don't commit code that cannot be executed
```ts::Bad
function foo(): void {
console.log(`Hello`)
```
```ts::Good
function foo(): void {
console.log(`Hello`)
}
```
## Don't allow code clones
```ts::Bad
function check_odd_or_even(input_number: number): string {
if (input_number % 2 == 0) {
return `${input_number} is Even`
} else {
return `${input_number} is Odd`
}
}
```
```ts::Good
function check_odd_or_even(input_number: number): string {
let result = input_number % 2 == 0 ? 'Even' : 'Odd'
return `${input_number} is ${result}`
}
```