scrap.qmd

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title: "Untitled"
format: revealjs
editor: visual
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## Grammar Structure 3: Evaluation of Functions

A function has a **function name**, **input** **arguments**, and **returns** a data type.

::: callout-tip
## Execution rule for functions:

A function's input arguments, when there's more than one, can be specified by:

-   The order the input given: `pow(2, 3)` is different than `pow(3, 2)`.

-   The name of the input argument: `pow(base=2, exp=3)`.

If the arguments contain expressions, evaluate those expressions first!
:::

## Examples

```{python}
pow(2, 3)
```

```{python}
pow(base=2, exp=3)
```

```{python}
pow(exp=3, base=2)
```

. . .

```{python}
max(len("hello"), 4)
```

## Learning a new function

1.  Function documentation

```         
?pow

pow(base, exp, mod=None)
Equivalent to base**exp with 2 arguments or base**exp % mod with 3 arguments
 
Some types, such as ints, are able to use a more efficient algorithm when
invoked using the three argument form.
```

. . .

2.  Documents page of a Python Module

[Base Python documentation of `pow`](https://docs.python.org/3/library/functions.html#pow)

. . .

3.  Forums vetted by experts, such as [SlackOverflow](https://stackoverflow.com/questions/tagged/pow+python)