Join Labels

Build a compact label string from the first records in a stream.

join_labels.lua

local limit = 
local joined = ""
local count = 0

for _, label in ipairs({"red", "green", "blue"}) do
  if count < limit then
    if joined ~= "" then
      joined = joined .. "|"
    end
    joined = joined .. label
    count = count + 1
  end
end

print("limit=" .. limit)
print("count=" .. count)
print("joined=" .. joined)

local limit = 
local joined = ""
local count = 0

for _, label in ipairs({"red", "green", "blue"}) do
  if count < limit then
    if joined ~= "" then
      joined = joined .. "|"
    end
    joined = joined .. label
    count = count + 1
  end
end

print("limit=" .. limit)
print("count=" .. count)
print("joined=" .. joined)

local limit = 
local joined = ""
local count = 0

for _, label in ipairs({"red", "green", "blue"}) do
  if count < limit then
    if joined ~= "" then
      joined = joined .. "|"
    end
    joined = joined .. label
    count = count + 1
  end
end

print("limit=" .. limit)
print("count=" .. count)
print("joined=" .. joined)

limit The selected limit controls how many labels enter the joined output.

separator The pipeline appends separators only between selected labels.