ts-pattern is a TypeScript library that provides a functional programming concept called pattern matching. It can significantly improve code readability in several ways:
- Simplifies Conditional Statements ts-pattern replaces complex if-else chains or switch statements with concise and expressive pattern matching.
- Reduces Boilerplate Code It eliminates the need for repetitive checks and type guards, making your code more compact.
- Improves Error Handling Pattern matching ensures that all possible cases are handled, reducing the likelihood of errors.
- Enhances Expressiveness ts-pattern's syntax clearly communicates the intent of your code, making it easier for others to understand.
- Supports Advanced Matching It offers features like guards, arrays, objects, and wildcard patterns, making complex logic easier to manage.
- Integrates Well with TypeScript ts-pattern leverages TypeScript's type system, providing type safety and auto-completion.
- Reduces Cognitive Load By breaking down complex logic into smaller, manageable pieces, ts-pattern reduces mental effort. Example Before (without ts-pattern):
function greet(person: { name: string; age: number } | null | undefined): string {
if (person === null) {
return 'Hello, stranger!';
} else if (person === undefined) {
throw new Error('Person is undefined');
} else {
return `Hello, ${person.name}! You are ${person.age} years old.`;
}
}
After (with ts-pattern):
import { match } from 'ts-pattern';
function greet(person: { name: string; age: number } | null | undefined): string {
return match(person)
.with(null, () => 'Hello, stranger!')
.with(undefined, () => { throw new Error('Person is undefined'); })
.with({ name, age }, ({ name, age }) => `Hello, ${name}! You are ${age} years old.`)
.exhaustive();
}
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