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## Chapter 2.19

# Essential Lisp Libraries

> "He seeks order, not truth. Suppose truth defies order, will he accept it? Will you? I think not."
> <footer>Robert A. Heinlein, <em>Life-Line</em></footer>

**Revision Note:** *This chapter's intro text needs minor expansion.*

Introduce or review through exercises a number of essential lisp libraries that are included in nearly all serious projects, in some cases being considered extensions to the standard.

For starters:

* ASDF
* Alexandria
* CL-PPCRE
* CL-FAD
* Flexi-Streams
* Babel
* Ironclad

## Exercise 2.19.1

**ASDF**

```lisp

```

## Exercise 2.19.2

**More ASDF**

```lisp

```

## Exercise 2.19.3

**Even More ASDF**

```lisp

```

## Exercise 2.19.4

**Alexandria**

```lisp

```

## Exercise 2.19.5

**More Alexandria**

```lisp

```

## Exercise 2.19.6

**Even More Alexandria**

```lisp

```

## Exercise 2.19.7

**CL-PPCRE**

```lisp

```

## Exercise 2.19.8

**More CL-PPCRE**

```lisp

```

## Exercise 2.19.9

**Even More CL-PPCRE**

```lisp

```

## Exercise 2.19.10

**CL-FAD**

```lisp

```

## Exercise 2.19.11

**More CL-FAD**

```lisp

```

## Exercise 2.19.12

**Even More CL-FAD**

```lisp

```

## Exercise 2.19.13

**Flexi-Streams**

```lisp

```

## Exercise 2.19.14

**More Flexi-Streams**

```lisp

```

## Exercise 2.19.15

**Even More Flexi-Streams**

```lisp

```

## Exercise 2.19.16

**Babel**

```lisp

```

## Exercise 2.19.17

**More Babel**

```lisp

```

## Exercise 2.19.18

**Even More Babel**

```lisp

```

## Exercise 2.19.19

**Ironclad**

```lisp

```

## Exercise 2.19.20

**More Ironclad**

```lisp

```

## Exercise 2.19.21

**Even More Ironclad**

```lisp

```

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