newRPL - build 1255 released! [updated to 1299]

[Gilles]

(06-04-2019 08:46 PM)Claudio L. Wrote:  

(06-04-2019 11:11 AM)Gilles Wrote:  Not a priority at all and I know that DOSUBS or MAP do the job. But it could be nice to have a kind of FOR IN syntax :

{ 1 2 3 4 7 9 } FORIN 'MyDigit' ... NEXT
or
{"Red" "Yellow" "Blue" } FORIN 'MyColor' ... NEXT
or why not :
"abcdefxyz" FORIN 'MyChar' .... NEXT

Perhaps FOR instead of FORIN would be sufficiant, as it depends of the type of the object before FOR

I like it as an alternative format for FOR. NEXT would simply advance in the list. Is there any use for STEP? Perhaps add the number to the index within the list, so you can skip backwards or more than one item forward. The loop ends whenever the index is out of bounds.

I thinked about STEP. It coud be something like this

{ 1 2 3 4 7 9 } FOR 'MyDigit' ... NEXT
'MyDigit' is 1 for the first loop, 2 for the next loop etc.

{ 1 2 3 4 7 9 } FOR 'MyDigits' ... 2 STEP
'MyDigits' is { 1 2 } for the fisrt loop and { 3 4 } for the second loop etc.

{ 1 { "a" "b"} 4 7 9 } FOR 'MyStuff' ... 2 STEP
'MyStuff' is { 1 {"a" "b"} } for the fisrt loop and { 4 7 } for the second loop etc.

I like this because you can't do this easily with DOSUBS (with dosub we get 1 2 and 2 3 and 3 4 etc...
For the last loop, the list may content less elements but it's not a problem.

Negative step could do the same beginning by the end of the list. In this case, perhaps { 7 9 } and {3 4 } is better than { 9 7 } and { 4 3 } ?

The keyword could be FOR or FOREACH.