MAP

Synopsis
MAP templatelist data
(MAP templatelist data1 data2 ...)
Description

Outputs a word or list, depending on the type of the data input, of the same length as that data input. (If more than one data input are given, the output is of the same type as data1.) Each item of the output is the result of evaluating the templatelist, filling the slots with the corresponding item(s) of the data input(s). (All data inputs must be the same length.) In the case of a word output, the results of the template evaluation must be words, and they are concatenated with WORD.

In a template, the symbol ?REST represents the portion of the data input to the right of the member currently being used as the ? slot-filler. That is, if the data input is [A B C D E] and the template is being evaluated with ? replaced by B, then ?REST would be replaced by [C D E]. If multiple parallel slots are used, then (?REST 1) goes with ?1, etc.

In a template, the symbol # represents the position in the data input of the member currently being used as the ? slot-filler. That is, if the data input is [A B C D E] and the template is being evaluated with ? replaced by B, then # would be replaced by 2.

Example
SHOW MAP [2 * ?] [1 2 3 4 5 6]
[2 4 6 8 10 12]
SHOW (MAP "LIST [a b c] [d e f])
[[a d] [b e] [c f]]

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