The value that is returned from a call to a function is the value of that function call. For example, with that function we can set a variable to the value that is returned using the following code (which would set result to 5). var result = num(3,3); The difference between functions and other variables is that the function has to be run in order to determine its value.
Slag glass, also known as marble glass or malachite, is a type of opaque, streaked pressed glass.ne of the first glass foundries to produce slag glass (although it was not called that at the time) was the Gateshead, England, firm of Sowerby, which patented its recipe for purple malachite glass in 1878.
A blast furnace produces two products: one is the pig iron that is the marketable/usable product and the other is slag that is typically discarded at the site. It was used later for roadkill and also apparently used to make some variants of Depression Glass.last furnace slag is distinctive. It is a dense glass. The colors come both from minerals and elements within the iron ore and the fluxing agent. There is archaeo-metallurgical discussion going on as to whether the process or the ingredients or both and if so, how much of either, if any, influenced the color.