Pros and Cons of Five Popular Programming Languages: JavaScript, Haskell, Go, PHP, and Elixir

In recent years I have had the opportunity to try many different programming languages. I love learning different languages, methods, and paradigms. I am curious and fascinated by programming languages. Each language is different; in this article we discuss the advantages and disadvantages of five major programming languages.

JavaScript

Haskell

Go

PHP

Elixir

01 JavaScript

Advantages

Fast prototyping: you can quickly write prototypes and even use Node.js for backend proof‑of‑concepts.

Flexibility: ES6 metaprogramming features increase popularity, and the language can be used for client, server, and mobile (e.g., React Native) development.

Community: a strong community, abundant answers on StackOverflow, and the npm ecosystem.

Functional features: higher‑order functions, arrow functions, and other functional concepts.

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

Asynchronous programming support.

Disadvantages

Dynamic typing can lead to surprising runtime coercions (e.g., 10 + "10" === "1010" ).

Weird language quirks caused by implicit type conversion (e.g., [] + {} === "[object Object]" but {} + [] === 0 ).

Limited support for tail‑call optimization (only WebKit implements it).

Constants for objects/arrays are mutable, similar to Java's final but not truly immutable.

02 Haskell

Advantages

Mind‑set shift: forces you to think about code in a completely different way.

Performance: compiled language with many compile‑time optimisations.

Powerful Hindley‑Milner type system with type inference.

Elegant syntax that is enjoyable to read.

Rich class system, more powerful than Java interfaces.

Well‑designed language that avoids many common pitfalls.

Pattern matching is both fun and powerful.

Lazy evaluation: expressions are only computed when needed.

Disadvantages

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

Scarce learning resources and limited mentorship.

Monads are conceptually difficult for many newcomers.

Heavy terminology (functors, applicatives, monoids) can be overwhelming.

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"

03 Go

Advantages

Low learning curve: a simple syntax similar to C makes it easy for developers with JavaScript, PHP, Java, or C experience.

Excellent performance even without low‑level optimisations.

Simple concurrency with goroutines.

Large, high‑quality ecosystem of packages.

Go modules simplify dependency management.

Disadvantages

No generics (as of Go 1.x), making reusable functions harder to write.

No arrow‑function syntax; anonymous functions feel verbose.

Lacks a ternary operator, leading to more boilerplate.

Error handling is explicit and can feel cumbersome.

myVar := 10 > 5 ? "foo" : "bar"

val, err := someFunc("foo")
if err != nil {
  handleError(err)
}

04 PHP

Advantages

Easy to start: many first projects are built with PHP.

Simple deployment: works out of the box with Apache or NGINX.

Rich ecosystem of libraries, similar to JavaScript.

Rapid prototyping: can build MVPs in a few hours.

Simple syntax for quick scripts.

Disadvantages

.htaccess files can be confusing and cause hard‑to‑debug caching issues.

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

Design inconsistencies (e.g., "foobar" == 0 evaluates to true).

Lack of built‑in Unicode support (still under discussion).

Procedural code can be hard to read; OOP adds complexity.

Some language features are poorly designed (static variables in instance methods, varying integer sizes, etc.).

<?php
  $initial = 'M';
  $name = (
    ($initial == 'M') ? 'Mitch'
    : ($initial == 'K') ? 'Kevin'
    : ($initial == 'J') ? 'John'
    : ($initial == 'A') ? 'Andrew'
    : 'unknown');
  echo $name; // Andrew
?>

05 Elixir

Advantages

OTP provides everything needed to build large, scalable, real‑time distributed systems.

Performance is strong; after parallelisation it can beat Java in many cases.

Powerful metaprogramming capabilities.

Ruby‑like syntax makes code pleasant to read and write.

Disadvantages

Dynamic typing means you miss the strong‑type guarantees of languages like Haskell.

Metaprogramming can hide behaviour behind macros (the "magic").

Parentheses are optional but often required, which can be confusing.

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