Parameters

A parameter is a variable in a method definition. To say it another way, a parameter is the variable in the declaration of the function, and it is found inside of the parenthesis.

File Location

We will be working in the following file:

    javascript-library
        └── 0-PreWork
        └── 1-Fundamentals
            └── 4-Functions
                05-parameters.js <----You will be working in this file.

Sample Code

In the function below, we see two parameters: name & type.

function petNameAndBreed(name, type){
    var petDetails = name + ", " + type;
    console.log(petDetails);
    return petDetails;
}

Arguments

We'll talk in the next module about arguments, but the following function calls show how the parameters work like variables. We put a different value in each time we call it:

petNameAndBreed("Johnny", "Tortoise Shell Cat");
petNameAndBreed("Sansa", "Bulldog");

Key Points

We'll get a lot more practice with parameters in the future. The key takeaways are these points:

1. Parameters are like variables.

2. Declared in the parenthesis of a function.

3. The arguments are the values that get assigned to the parameters when the function is called.