# Inline

#### Example

Here's a basic example of an inline function that adds two numbers:

```javascript
add = def(x, y) -> (
  return x + y
)

// Usage
result = add(5.0, 3.0)
```

In this example, `add` is an inline function that takes two arguments, `x` and `y`, and returns their sum. This function can be called multiple times throughout your shader code to perform addition operations.

## Functions as arguments

In osl you can use a function as arguments for other functions, methods and commands. This allows for powerful new syntax such as the `.map()` method which iterates over each item in an array and overwrites it based on the function it is passed as argument.

```javascript
arr = [1,2,3,4,5]

log arr.map(def(item) -> (
  return item * 2
  // set each item to itself * 2
))

// [2,4,6,8,10]
```

You can also define a function earlier and then pass it as input

```javascript
arr = [1,2,3,4,5]

// define the function into the global func variable
func = def(item) -> (
  return item * 2
  // set each item to itself * 2
)

log arr.map(func)
// pass the function as a parameter

// [2,4,6,8,10]
```


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