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JavaScript vs TypeScript: Which Should You Use?
Understand the critical differences between dynamic and static typing, and learn when to stick with JavaScript or upgrade to TypeScript.
Quick Comparison
Category
JavaScript
TypeScript
Type System
Dynamic - Types are checked at runtime
Static - Types are checked at compile-time
Learning Curve
Beginner-Friendly - Simple to start writing code
Moderate - Requires learning type syntax and interfaces
Developer Experience
Flexible but error-prone in large projects
Excellent - IDE support, autocomplete, and fewer bugs
Compilation
None - Runs directly in the browser or Node.js
Required - Transpiles to JavaScript before execution
Ecosystem
Native web support, massive library collection
Full access to JS libraries with type definitions (@types)
Project Size
Ideal for small scripts and quick prototypes
Essential for large-scale enterprise applications
What is JavaScript?
JavaScript is the world's most popular programming language, powering the interactive features of nearly every website. It is dynamic, flexible, and has an incredibly low barrier to entry for beginners.
Pros of JavaScript:
- Runs natively in all browsers
- Fast to prototype and test ideas
- Huge community and package ecosystem
- No compilation step required
- Dynamic and flexible typing
- Excellent for simple scripts
What is TypeScript?
TypeScript is a strongly typed superset of JavaScript developed by Microsoft. It adds optional static typing to the language, enabling better tooling, earlier error detection, and more maintainable code for large-scale projects.
Pros of TypeScript:
- Catches errors during development
- Better IDE autocomplete & refactoring
- Clearer documentation via types
- Easier to maintain large codebases
- Modern JavaScript features support
- Strict null checking
Code Comparison: The Power of Types
JavaScript
// No type safety
function addNumbers(a, b) {
return a + b;
}
// This will return "510" (string)
console.log(addNumbers("5", 10));TypeScript
// Explicit types
function addNumbers(a: number, b: number): number {
return a + b;
}
// Error: Argument of type 'string' is not
// assignable to parameter of type 'number'.
addNumbers("5", 10);Master Both Languages
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