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whilevarn <gamevar> <value> { code to execute }
whilevarvarn <gamevar> <gamevar> { code to execute }

Executes the code in the curly braces as long as <gamevar> does not equal <value>. This is a simple while loop.

Caution: Poor execution or endless loops will cause your game to close without error or simply stall and crash!

This example will set up the palette of the floor from all sectors on the map:

gamevar TEMP 0 0
  setvar TEMP 0
  whilevarvarn TEMP NUMSECTORS
    setsector[TEMP].floorpal 1
    addvar TEMP 1

There's no variable keeping the number of sprites in the map. The sprites may be randomly arranged throughout the array with a maximum of 16384 entries. An example of a correct per-sprite loop:

setvar sectnum 0
whilevarvarn sectnum NUMSECTORS
  headspritesect I sectnum
  setvarvar HEAD I
  whilevarn I -1 {
    // LOOP CODE
    nextspritesect I I
    ifvarvare I HEAD setvar I -1 // Break the loop
  addvar sectnum 1

Commands with an additional "var" suffix take gamevars rather than constants or defined labels for their inputs. As an alternate short form, "varvar" can be dropped from these commands; for example ife serves an an alias for ifvarvare.