local component = require("component")
-- Assuming the generator was just added to a robot and
-- the selected slot contains one stack of coal:
local g = component.generator -- get primary generator component
print(g.count()) -- 0
g.insert(1) -- true
print(g.count()) -- 0 because the item was immediately consumed, generator is running now
g.insert(5)
print(g.count()) -- 5
g.remove() -- remove everything from the generator
print(g.count()) -- 0
g.insert() -- insert everything into the generator
print(g.count()) -- 63 (minus the one consumed in the beginning)