Arguments

Part of the Fundamentals section of Coddy's JavaScript journey — lesson 46 of 77.

An argument is a value you pass into a function when you call it.
A parameter is the variable inside the function that receives that value.

To define a function with parameters, we write them inside parentheses:

function functionName(param1, param2) {
    code
}

We can name the parameters as we want, and we can write as many arguments as we need.

To call a function and pass arguments to it, we write:

functionName(value1, value2, value3, ...)

Example of usage:

function isEven(number) { // "number" is a parameter
    if (number % 2 === 0) {
        console.log(`${number} is even`);
    } else {
        console.log(`${number} is odd`);
    }
}

for (let i = 15; i < 34; i++) {
    isEven(i); // i is the argument
}
for (let i = 153; i < 219; i++) {
    isEven(i); // argument again
}

Here, number is the parameter (placeholder), and each value we pass (like 15 or 153) is an argument.

Challenge

Easy

Write a program that gets two inputs, numbers. The input numbers are the parameters of the below function.

Create a function that gets two parameters, multiplies them (calculates the product) and prints the result, name the function however you like.

Call the function with the input numbers.

Note! In your code, write the function before it's call/execution statements.

Cheat sheet

Functions can accept parameters (placeholders in the function) and receive arguments (actual values passed in).

Define parameters inside the parentheses:

function functionName(param1, param2) {
    code
}

Call a function by passing arguments (values):

functionName(value1, value2, value3, ...)

Example:

function isEven(number) { // "number" is a parameter
    if (number % 2 === 0) {
        console.log(`${number} is even`);
    } else {
        console.log(`${number} is odd`);
    }
}

isEven(15); // 15 is an argument

Try it yourself

let a = parseInt(inp[0]); // Don't change this line
let b = parseInt(inp[1]); // Don't change this line
// Type your code below

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

The Language Hello World!Comments Code Structure

4Operators Part 2

Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3 Type Coercion

7Bill Split Calculator

Welcome Message Calculating The Tip And Total

Splitting The Bill

Formatted Output

10FizzBuzz with a Twist

Game Overview The FizzBuzz Function

Looping The Numbers

Adding The Twist

13Grocery List Tracker

Project Overview Add Item

Remove Item

View List