Sometimes in our programs, however, we need variables whose values can be modified.

If you try to reassign a constant variable, this will result in a compiler error. This is where mutable variables come in.

Mutable variables are variables whose values can be modified.

Before you can use a mutable variable you need to declare it. There are two ways, either you declare and assign the variable to a value in one step:

5300 ➡️ 🖍🆕 money

Here, we are declaring a mutable variable named money and assigning it a value of 5300.

Or you explicitly declare the variable, in which case it won’t have a value initially:

🖍🆕 money 🔡

• 🖍🆕 means declaring
• money is the name of the variable
• 🔡 is the type of the variable