Pros and Cons of JavaScript, Haskell, Go, and PHP

I enjoy learning different programming languages, paradigms, and methods, and in this article I discuss the advantages and disadvantages of four major languages.

JavaScript

Pros

Fast prototyping: quickly write prototypes and even backend proofs of concept with Node.js.

Flexibility: ES6 metaprogramming features and ability to write client, server, and mobile code (e.g., React Native).

Strong community: abundant answers on StackOverflow and a massive npm ecosystem.

Functional programming support: higher‑order functions, arrow functions, etc.

Modern syntax sugar: object/array destructuring, spread operator, etc.

Asynchronous handling: promises, async/await make async code manageable.

Cons

Dynamic typing can cause runtime errors (e.g., 10 + "10" === "1010").

Some odd language features arise from implicit type coercion (e.g., [] + {} === "[object Object]").

Tail‑call optimization is only supported in WebKit.

Objects/arrays declared with const are still mutable.

Haskell

Pros

Mind‑shift: forces a completely different way of thinking about code.

Performance: compiled language with many compile‑time optimisations.

Powerful type system: Hindley‑Milner inference and clear type declarations.

Elegant syntax and pattern matching make code enjoyable to read.

Rich type classes similar to Java interfaces but more expressive.

Design encourages correctness over clever tricks.

Lazy evaluation: computations are performed only when needed.

Cons

Steep learning curve; often feels like you need a background in category theory.

Scarce learning resources and mentorship.

Monads and other abstractions can be hard to grasp.

Terminology differs greatly from mainstream languages, requiring a shift in mental model.

sayMe :: (Integral a) => a -> String
sayMe 1 = "One!"
sayMe 2 = "Two!"
sayMe 3 = "Three!"
sayMe 4 = "Four!"
sayMe 5 = "Five!"
sayMe x = "Not between 1 and 5"

Go

Pros

Low learning barrier: familiar syntax for developers of C‑like languages.

Excellent performance even without low‑level tuning.

Simple concurrency with goroutines.

Robust ecosystem and high‑quality packages.

Go modules simplify dependency management.

Cons

No generics (as of this writing), making reusable abstractions harder.

Lack of arrow‑function syntax.

No ternary operator. myVar := 10 > 5 ? "foo" : "bar"

Error handling is verbose and unconventional. val, err := someFunc("foo") if err != nil { handleError(err) }

PHP

Pros

Easy to start with; many developers begin here.

Simple deployment: works with Apache or NGINX without extra setup.

Rich ecosystem of libraries, similar to JavaScript.

Rapid prototyping for MVPs and proofs of concept.

Straightforward syntax for quick scripts.

Cons

.htaccess files can be confusing and error‑prone.

Module system is weak; includes are essentially copy‑paste.

Design quirks such as "foobar" == 0 evaluating to true.

Inconsistent handling of static variables and Unicode support.

Some language features feel like legacy baggage. <?php $initial = 'M'; $name = ( ($initial == 'M') ? 'Mitch' : ($initial == 'K') ? 'Kevin' : ($initial == 'J') ? 'John' : ($initial == 'A') ? 'Andrew' : 'unknown'); echo $name; // Andrew ?>

Overall, each language offers distinct strengths and trade‑offs, and the best choice depends on project requirements, team expertise, and long‑term maintenance considerations.