XLISP set

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# set

Type: | - | function (subr)
Source: | - | xlbfun.c

## Syntax

(set symbol expr)
  symbol - expression that evaluates to a symbol name [if the expression is quoted, no evaluation occurs]
  expr - an expression, which will be the new value
  returns - the new value

## Description

The 'set' function evaluates 'symbol' and sets 'expr' as it's value. If the 'symbol' value is quoted via the quote special form or read-macro expansion, the 'symbol' is not evaluated. 'set' returns the value from 'expr' as it's result.

## Examples

    (set 'a 2)            ; sets symbol A to value 2
    (set 'value a)        ; sets symbol VALUE to value 2
    (print value)         ; show the value - prints 2

    (set 'name 'myvar)    ; set symbol NAME to value MYVAR
    (set name 12345)      ; set symbol which is the value
                          ;   of NAME (MYVAR) to 12345

    (print name)          ; prints MYVAR
    (print myvar)         ; prints 12345

    (set notsymbol 1)     ; error: unbound variable
    (set name notvalue)   ; error: unbound variable

See the set function in the XLISP 2.0 manual.

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Nyquist / XLISP 2.0 - Contents | Tutorials | Examples | Reference