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Task/CSV-data-manipulation/Lua/csv-data-manipulation.lua

@@ -0,0 +1,31 @@
+local csv={}
+for line in io.lines('file.csv') do
+    table.insert(csv, {})
+    local i=1
+    for j=1,#line do
+        if line:sub(j,j) == ',' then
+            table.insert(csv[#csv], line:sub(i,j-1))
+            i=j+1
+        end
+    end
+    table.insert(csv[#csv], line:sub(i,j))
+end
+
+table.insert(csv[1], 'SUM')
+for i=2,#csv do
+    local sum=0
+    for j=1,#csv[i] do
+        sum=sum + tonumber(csv[i][j])
+    end
+    if sum>0 then
+        table.insert(csv[i], sum)
+    end
+end
+
+local newFileData = ''
+for i=1,#csv do
+    newFileData=newFileData .. table.concat(csv[i], ',') .. '\n'
+end
+
+local file=io.open('file.csv', 'w')
+file:write(newFileData)