Type Annotations
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Rule: Use TypeScript to add type annotations to your JavaScript code.
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Reason: Static type checking in TypeScript helps catch errors early, improves code quality, and boosts developer productivity by providing better code suggestions and error checking.
Example:
function greet(name: string): string {
return `Hello, ${name}`;
}
Interfaces and Classes
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Rule: Leverage interfaces to declare the shape of objects and classes to encapsulate data and behavior.
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Reason: Interfaces ensure that objects conform to a particular structure, and classes group related data and methods for better organization.
Example:
interface Person {
name: string;
age: number;
}
class Employee implements Person {
constructor(public name: string, public age: number) {}
}
Generics
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Rule: Use generics to create reusable and flexible components that work with any data type.
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Reason: Generics allow you to write functions, classes, and interfaces that can handle multiple data types while maintaining type safety.
Example (Correct):
function identity<T>(arg: T): T {
return arg;
}
Compilation
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Rule: Configure the TypeScript compiler (
tsc) using atsconfig.jsonfile to target specific ECMAScript versions and manage other compiler options. -
Reason: Proper configuration of
tsconfig.jsonensures compatibility with different JavaScript environments and fine-tuning of the TypeScript compiler
Example (tsconfig.json):
{
"compilerOptions": {
"target": "ES6",
"module": "commonjs",
"strict": true
}
}
Summary:
- TypeScript: Use type annotations, interfaces, classes, and generics for better code quality and productivity.