In programming, variables are like the boxes that hold your data. They allow you to store and manipulate information through the code. Understanding variables is fundamental to building powerful applications.
How to declare variables?
There are two ways to declare variables:
var (Variable): This keyword signifies a variable whose value can change throughout your program. It's ideal for situations where the data needs to be modified or updated.
var name = "The Coder Buddy"
name = "Your Coding Companion" // Updating the value of the variable
print(name) // Output: "Your Coding Companion"
let (Constant): This keyword defines a constant value that remains unchanged after its initial assignment. Use constants when the data shouldn't be modified, enhancing code clarity and preventing accidental changes.
let pi = 3.14159
// pi = 22/7 (This will cause an error as constants cannot be changed)
print(pi) // Output: 3.14159
The best practice is to use "let" by default and switch to "var" only when the value is going to change. This helps prevent unintended changes and makes your code more maintainable.
Comentários