Summary  
Default values allow function parameters to automatically take predefined fallback values when no argument (or undefined) is passed, using a concise `parameter = default` syntax.

General domain of usage  
Function parameter handling

**Default values** are values that are taken up by the parameters of a function when no corresponding argument is passed into the function call.

Definition

We can assign **default values** to parameters using the syntax:
```js
function funcName(parameter1 = value1, parameter2 = value2, …) {
  // your code here …
}
```

**Example:**

function sum(a = 5, b = 10) {
  return a + b;
}

console.log(sum()); // Output: 15

What happens if a function parameter has a default value and no argument is passed for it in the function call?

What will be the output of the following code?

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Default Values

1. What happens if a function parameter has a default value and no argument is passed for it in the function call?

2. What will be the output of the following code?

3. What will be the output of the following code?

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Default Values

1. What happens if a function parameter has a default value and no argument is passed for it in the function call?

2. What will be the output of the following code?

3. What will be the output of the following code?