---
id: 56533eb9ac21ba0edf2244bd
title: Passing Values to Functions with Arguments
challengeType: 1
videoUrl: 'https://scrimba.com/c/cy8rahW'
forumTopicId: 18254
---

## Description
<section id='description'>
<dfn>Parameters</dfn> are variables that act as placeholders for the values that are to be input to a function when it is called. When a function is defined, it is typically defined along with one or more parameters. The actual values that are input (or <dfn>"passed"</dfn>) into a function when it is called are known as <dfn>arguments</dfn>.
Here is a function with two parameters, <code>param1</code> and <code>param2</code>:

```js
function testFun(param1, param2) {
  console.log(param1, param2);
}
```

Then we can call <code>testFun</code>:
<code>testFun("Hello", "World");</code>
We have passed two arguments, <code>"Hello"</code> and <code>"World"</code>. Inside the function, <code>param1</code> will equal "Hello" and <code>param2</code> will equal "World". Note that you could call <code>testFun</code> again with different arguments and the parameters would take on the value of the new arguments.
</section>

## Instructions
<section id='instructions'>
<ol><li>Create a function called <code>functionWithArgs</code> that accepts two arguments and outputs their sum to the dev console.</li><li>Call the function with two numbers as arguments.</li></ol>
</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>functionWithArgs</code> should be a function.
    testString: assert(typeof functionWithArgs === 'function');
  - text: <code>functionWithArgs(1,2)</code> should output <code>3</code>.
    testString: if(typeof functionWithArgs === "function") { capture(); functionWithArgs(1,2); uncapture(); } assert(logOutput == 3);
  - text: <code>functionWithArgs(7,9)</code> should output <code>16</code>.
    testString: if(typeof functionWithArgs === "function") { capture(); functionWithArgs(7,9); uncapture(); } assert(logOutput == 16);
  - text: You should call <code>functionWithArgs</code> with two numbers after you define it.
    testString: assert(/functionWithArgs\([-+]?\d*\.?\d*,[-+]?\d*\.?\d*\)/.test(code.replace(/\s/g, '')));
```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js



```

</div>

### Before Test
<div id='js-setup'>

```js
var logOutput = "";
var originalConsole = console
function capture() {
    var nativeLog = console.log;
    console.log = function (message) {
        if(message) logOutput = JSON.stringify(message).trim();
        if(nativeLog.apply) {
          nativeLog.apply(originalConsole, arguments);
        } else {
          var nativeMsg = Array.prototype.slice.apply(arguments).join(' ');
          nativeLog(nativeMsg);
        }
    };
}

function uncapture() {
  console.log = originalConsole.log;
}

capture();
```

</div>

### After Test
<div id='js-teardown'>

```js
uncapture();

if (typeof functionWithArgs !== "function") { 
  (function() { return "functionWithArgs is not defined"; })();
} else {
  (function() { return logOutput || "console.log never called"; })();
}
```

</div>

</section>

## Solution
<section id='solution'>


```js
function functionWithArgs(a, b) {
  console.log(a + b);
}
functionWithArgs(10, 5);
```

</section>