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(foreach variable list expression ...)


Apply the expression to every item in the list.


This function performs an expression on each of the elements of the list. The first argument for foreach is variable. This is a temporary variable where the changed elements are stored. Next is the list argument, containing the elements to be affected. Following the list are one or more expressions, detailing the action to be performed on the list elements. The foreach function returns the result of the last evaluation.

Example

Code

(setq sample '(1.0 1.5 2.0 2.5))

(foreach var sample (progn

(setq var (* 2.0 var))

(princ (strcat "\nTwice the value is " (rtos var)))))

(princ)

Result

    Twice the value is 2.0000
    Twice the value is 3.0000
    Twice the value is 4.0000
    Twice the value is 5.0000

(mapcar function list1 [list2 ...])

LISP Compatibility

Programming Overview of LISP (LISt Processing) Language

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