dry.ts

// DRY PRINCIPLE

/*

Fast Overview
- D: Dont 
- R: Repeat 
- Y: Yourself

*/

// Each code block should be defined just one time in the codebase
// If you should modify something, you should be able to do it in just one section of the code
// The opposite to the DRY principle is WET ( Write Everything Twice )

/*
	Sometimes forcing ourselves to use DRY could make the code less readable.
	- If two functions are similar but not strictly equal, its better to make 2 separate funcitons rather than 1
	- The DRY principle should always be balanced with the KISS principle (see kiss.ts) to mantain the code simple 
*/


// ? Wrong Example
// If i'm gonna change the discount logic, then i need to modify it in each part where i use it
function makeCheckout(price: number): number {
	const discount = price > 100 ? price * 0.1 : 0;
	return price - discount
}

function makeRefund(price: number): number {
	const discount = price > 100 ? price * 0.1 : 0;
	return price - discount
}

// ? Correct Example
// I can change the discount calculus in just one place and it affects everything related to that
function calculateDiscount(price: number): number {
	return price > 100 ? price * 0.1 : 0
}

function checkout(price: number): number {
	return price - calculateDiscount(price)
}

function refund(price: number): number {
	return price - calculateDiscount(price)
}