4 Programming Habits to Unlearn for Cleaner, More Efficient Code

1. Abandon Loops

Loops are often the first constructs learned, but using while or for can lead to verbose and error‑prone code. For example, given an array of grocery objects, a while loop prints each name while manually tracking an index:

const groceries = [
  { name: 'Face Masks', price: 17.50 },
  { name: 'Disinfecting Wipes', price: 24.99 },
  { name: 'Goggles', price: 8.99 },
  { name: 'Gloves', price: 25.99 },
  { name: 'Hand Sanitizers', price: 24.99 }
];
let index = 0;
while (index < groceries.length) {
  console.log(groceries[index].name);
  index = index + 1;
}

This works but risks infinite loops if the index isn’t incremented. A cleaner alternative uses forEach, a higher‑order function that abstracts the iteration:

groceries.forEach(item => {
  console.log(item.name);
});

Higher‑order functions remove manual index handling and make intent explicit.

2. Abandon Conditional Statements

Complex if‑else or switch blocks increase code size and coupling. Consider a discount function:

const discount = (amount, code) => {
  switch (code) {
    case 'DIJFNC': return amount * 0.80;
    case 'XPFJVM': return amount * 0.75;
    case 'FJDPCX': return amount * 0.50;
  }
};

Adding new codes requires editing the switch, risking errors. Replacing the switch with a data object decouples data from logic:

const DISCOUNT_MULTIPLIER = {
  'DIJFNC': 0.80,
  'XPFJVM': 0.75,
  'FJDPCX': 0.50
};
const discount = (amount, code) => amount * DISCOUNT_MULTIPLIER[code];

Polymorphism offers another solution by delegating behavior to dedicated classes:

class CreditCardCheckout {
  static charge(amount) { /* complex credit‑card logic */ }
}
class DebitCardCheckout {
  static charge(amount) { /* complex debit‑card logic */ }
}
class CashCheckout {
  static charge(amount) { /* complex cash logic */ }
}
const customers = [
  { amount: 75.00, paymentMethod: CreditCardCheckout },
  { amount: 50.00, paymentMethod: DebitCardCheckout },
  { amount: 25.00, paymentMethod: CashCheckout }
];
customers.forEach(({ amount, paymentMethod }) => {
  paymentMethod.charge(amount);
});

This removes the bulky switch and isolates each payment method.

3. Abandon Vague Variable Names

Many tutorials use generic names like arr or n, which obscure intent. Rewriting the same logic with meaningful names improves readability:

const aisles = [
  'Breakfast Cereal',
  'Candy and Snack',
  'Dairy',
  'Paper Products and Cleaning Supplies'
];
const printAisleNumber = name => {
  const number = aisles.findIndex(aisleName => aisleName === name);
  console.log(number);
};
printAisleNumber('Dairy');

Descriptive identifiers convey purpose and make future modifications safer.

4. Abandon Global Scope

Relying on a single global namespace encourages tightly coupled code. Instead, treat each function, object, or class as its own encapsulated universe, focusing on clear interfaces and abstractions.

TL;DR Principles

Replace loops with higher‑order functions.

Replace conditionals with data structures or polymorphism.

Replace vague variable names with purposeful ones.

Forget the global scope; encapsulate code.