refactoring js code javascript beginner tutorial

refactoring javascript code: a beginner's tutorial

refactoring is the process of restructuring existing computer code—changing the factoring—without changing its external behavior. the primary purpose of refactoring is to improve the structure of the code, making it easier to read, maintain, and extend. this tutorial will guide you through the basics of refactoring javascript code, complete with examples.

why refactor?

1. **improved readability**: code that is easy to read is easier to maintain.
2. **easier maintenance**: well-structured code is easier to update and debug.
3. **reusability**: refactoring can help identify reusable components.
4. **performance**: sometimes, refactoring can improve the performance of the code.

basic refactoring techniques

1. **renaming variables and functions**: use descriptive names.
2. **extracting functions**: break down large functions into smaller, more manageable ones.
3. **removing duplicate code**: if you see the same code more than once, consider creating a function.
4. **using constants**: replace hard-coded values with named constants.
5. **improving control structures**: simplify complex conditionals.

example of refactoring

let’s start with a simple example of a function that calculates the total price of items in a shopping cart.

original code

```javascript
function calculatetotal(cart) {
let total = 0;
total += cart[i].price * cart[i].quantity;
}
return total;
}

const shoppingcart = [
{ price: 10, quantity: 2 },
{ price: 20, quantity: 1 },
{ price: 5, quantity: 5 }
];

```

step 1: renaming variables

make variable names more descriptive.

```javascript
function calculatetotal(cartitems) {
let totalprice = 0;
totalprice += cartitems[i].price * cartitems[i].quantity;
}
return totalprice;
}
```

step 2: extr ...

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