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The issue is that I forgot to add the E/e flag to the list of flags for the Color() method, so empty lines were removed from the JSON output. I will edit the accepted answer.
Can you give me an code snippet?
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Of the three options presented already, concatenating with $LISTBUILD() is by far the most performant. Running the following method
ClassMethod ListTest(l = 100000) { #; Concatenate with $LISTBUILD Set li="",zh=$ZHOROLOG For i=1:1:l Set li=li_$LISTBUILD(i) Write "Creating a list with length of ",$LISTLENGTH(li)," using $LISTBUILD() took ",$ZHOROLOG-zh," seconds",! #; Set $LIST Set li="",zh=$ZHOROLOG For i=1:1:l Set $LIST(li,i)=i Write "Creating a list with length of ",$LISTLENGTH(li)," using $LIST() took ",$ZHOROLOG-zh," seconds",! #; $LISTUPDATE Set li="",zh=$ZHOROLOG For i=1:1:l Set li=$LISTUPDATE(li,i,i) Write "Creating a list with length of ",$LISTLENGTH(li)," using $LISTUPDATE took ",$ZHOROLOG-zh," seconds" }on a recent version of IRIS produces these results:
USER>d ##class(User.Test).ListTest() Creating a list with length of 100000 using $LISTBUILD() took .007244 seconds Creating a list with length of 100000 using $LIST() took 10.156168 seconds Creating a list with length of 100000 using $LISTUPDATE took 10.954107 seconds