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The function tries to preserve the order of the array: the earliest non-unique value is kept, and all subsequent duplicate values are removed. For example, for the table {5, 4, 4, 3, 4, 2, 2, 1} removeDuplicates will return {5, 4, 3, 2, 1}.
A table is a sequence, optionally supplemented by named keys: digit["two"]="2". Several table functions like table.concat will only work with the numbered values and ignore named keys. The metatable offers a large, optional set of methods for altering table behavior. For example, you can define a table to be callable like a function.
Marshalling data between C and Lua functions is also done using the stack. To call a Lua function, arguments are pushed onto the stack, and then the lua_call is used to call the actual function. When writing a C function to be directly called from Lua, the arguments are read from the stack. Here is an example of calling a Lua function from C:
Vim has Lua scripting support starting with version 7.3. [33] VLC media player uses Lua to provide scripting support. Warframe uses Lua for HUD purposes and several other UI operations; Waze uses Lua internally. waze-4-35-0-15.apk includes Lua 5.3.3. WeeChat IRC client allows scripts to be written in Lua.
A sample of Lua is highlighted by tag <syntaxhighlight lang="lua">...</syntaxhighlight> placed around the Lua source code. To view some more complex examples of Lua, see article: "Lua (programming language)". For instructions on how to use Lua within MediaWiki (and hence Wikipedia), see mw:Extension:Scribunto/Lua reference manual.
Users can create two-dimensional simulations that model concepts, multi-level games, and interactive stories. Stencyl is a visual programming and game development IDE that has been used for education and commerce. The concept of code blocks it implements is based on MIT's Scratch visual language (listed above).
Functional programming – uses evaluation of mathematical functions and avoids state and mutable data Generic programming – uses algorithms written in terms of to-be-specified-later types that are then instantiated as needed for specific types provided as parameters
Save this script as e.g. lineplot.py and then run it with python lineplot.py. After a few seconds, a window with the interactive graphical output should pop up, and the SVG will also be in the folder. Numerous examples with Python source code are available, for example the Matplotlib gallery and commons:Category:Valid SVG created with ...