MAP
Synopsis
Do a procedure on each element of a list, recursively
Description
The MAP command EVALuates a specified program (or a variable which contains one) to a list of objects or values. If one of the objects is a list, MAP will apply the program recursively to the items in the inner list.
MAP is nominally designed for Pexec (or Nexec) requiring one argument and returning one result.
Compatibility
MAP is fully equivalent to its userRPL counterpart.
Usage
Input
4:
3:
2: { 1 2 { X Y } }
1: « 2 * »
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MAP
Output
4:
3:
2:
1: { 2 4 { 'X*2' 'Y*2' } }
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Related Commands
| Command | Short Description | |
|---|---|---|
| →LIST | Assemble a list from its elements | |
| LIST→ | Split a list into its elements | |
| DOLIST | Do a procedure with elements of lists | CHANGED |
| DOSUBS | Do a procedure on a subset of a list | CHANGED |
| MAP | Do a procedure on each element of a list, recursively | |
| MAPLIST→ | Do a procedure on each element recursively, return individual elements | NEW |
| STREAM | Do a procedure on consecutive elements of a list | |
| ΔLIST | First differences on the elements of a list | |
| ΣLIST | Sum of all elements in a list | CHANGED |
| ΠLIST | Product of all elements in a list | CHANGED |
| ADD | Concatenate lists and/or elements | CHANGED |
| SORT | Sort elements in a list | |
| REVLIST | Reverse the order of elements in a list | |
| ADDROT | Add elements to a list, keep only the last N elements | NEW |
| SEQ | Assemble a list from results of sequential procedure |