elt (ANSI and GNU Common Lisp Document)

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#### 17.3.3 elt [Accessor]

`elt` sequence index ⇒ object

(setf (`elt` sequence index) new-object)

#### Arguments and Values::

sequence—a proper sequence.

index—a valid sequence index for sequence.

object—an object.

new-object—an object.

#### Description::

Accesses the element of sequence specified by index.

#### Examples::

     (setq str (copy-seq "0123456789")) ⇒  "0123456789"
     (elt str 6) ⇒  #\6
     (setf (elt str 0) #\#) ⇒  #\#
     str ⇒  "#123456789"

#### Exceptional Situations::

Should be prepared to signal an error of type type-error if sequence is not a proper sequence. Should signal an error of type type-error if index is not a valid sequence index for sequence.

#### See Also::

aref , nth ,

Compiler Terminology

#### Notes::

aref may be used to access vector elements that are beyond the vector’s fill pointer.