loadfile ([filename])
Similar to load, but gets the chunk from file filename or from the standard input, if no file name is given.
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loadstring (string [, chunkname])
Similar to load, but gets the chunk from the given string.
To load and run a given string, use the idiom
assert(loadstring(s))()
When absent, chunkname defaults to the given string.
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next (table [, index])
Allows a program to traverse all fields of a table. Its first argument is a table and its second argument is an index in this table. next returns the next index of the table and its associated value. When called with nil as its second argument, next returns an initial index and its associated value. When called with the last index, or with nil in an empty table, next returns nil. If the second argument is absent, then it is interpreted as nil. In particular, you can use next(t) to check whether a table is empty.
The order in which the indices are enumerated is not specified, even for numeric indices. (To traverse a table in numeric order, use a numerical for or the ipairs function.)
The behavior of next is undefined if, during the traversal, you assign any value to a non-existent field in the table. You may however modify existing fields. In particular, you may clear existing fields.
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pairs (t)
Returns three values: the next function, the table t, and nil, so that the construction
for k,v in pairs(t) do body end
will iterate over all key-value pairs of table t.
See function next for the caveats of modifying the table during its traversal.
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pcall (f, arg1, ···)
Calls function f with the given arguments in protected mode. This means that any error inside f is not propagated; instead, pcall catches the error and returns a status code. Its first result is the status code (a boolean), which is true if the call succeeds without errors. In such case, pcall also returns all results from the call, after this first result. In case of any error, pcall returns false plus the error message.
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print (···)
Receives any number of arguments, and prints their values to stdout, using the tostring function to convert them to strings. print is not intended for formatted output, but only as a quick way to show a value, typically for debugging. For formatted output, use string.format.
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rawequal (v1, v2)
Checks whether v1 is equal to v2, without invoking any metamethod. Returns a boolean.
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rawget (table, index)
5. Standard libraries
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