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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.