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Index
copy-seq Sequences Dictionary fill
Accessor

elt

elt sequence index ⇒ object

(setf ( elt sequence index) new-object)

Arguments and Values

sequencea proper sequence.
indexa valid sequence index for sequence.
objectan object.
new-objectan 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.

Backlinks

and, aref, char, schar, Function Call Forms as Places, nth, Sequence Concepts, Sequences Dictionary, Symbols in the COMMON-LISP Package