Module pl.operator
Lua operators available as functions.
(similar to the Python module of the same name)
There is a module field optable which maps the operator strings
onto these functions, e.g. operator.optable['()']==operator.call
Operator strings like ‘>’ and ‘{}’ can be passed to most Penlight functions expecting a function argument.
Functions
| call (fn, ...) | apply function to some arguments () |
| index (t, k) | get the indexed value from a table [] |
| eq (a, b) | returns true if arguments are equal == |
| neq (a, b) | returns true if arguments are not equal ~= |
| lt (a, b) | returns true if a is less than b < |
| le (a, b) | returns true if a is less or equal to b <= |
| gt (a, b) | returns true if a is greater than b > |
| ge (a, b) | returns true if a is greater or equal to b >= |
| len (a) | returns length of string or table # |
| add (a, b) | add two values + |
| sub (a, b) | subtract b from a - |
| mul (a, b) | multiply two values * |
| div (a, b) | divide first value by second / |
| pow (a, b) | raise first to the power of second ^ |
| mod (a, b) | modulo; remainder of a divided by b % |
| concat (a, b) | concatenate two values (either strings or __concat defined) .. |
| unm (a) | return the negative of a value - |
| lnot (a) | false if value evaluates as true not |
| land (a, b) | true if both values evaluate as true and |
| lor (a, b) | true if either value evaluate as true or |
| table (...) | make a table from the arguments {} |
| match (a, b) | match two strings ~. |
| nop (...) | the null operation. |
Tables
| optable | Map from operator symbol to function. |
Functions
- call (fn, ...)
-
apply function to some arguments ()
Parameters:
- fn a function or callable object
- ... arguments
- index (t, k)
-
get the indexed value from a table []
Parameters:
- t a table or any indexable object
- k the key
- eq (a, b)
-
returns true if arguments are equal ==
Parameters:
- a value
- b value
- neq (a, b)
-
returns true if arguments are not equal ~=
Parameters:
- a value
- b value
- lt (a, b)
-
returns true if a is less than b <
Parameters:
- a value
- b value
- le (a, b)
-
returns true if a is less or equal to b <=
Parameters:
- a value
- b value
- gt (a, b)
-
returns true if a is greater than b >
Parameters:
- a value
- b value
- ge (a, b)
-
returns true if a is greater or equal to b >=
Parameters:
- a value
- b value
- len (a)
-
returns length of string or table #
Parameters:
- a a string or a table
- add (a, b)
-
add two values +
Parameters:
- a value
- b value
- sub (a, b)
-
subtract b from a -
Parameters:
- a value
- b value
- mul (a, b)
-
multiply two values *
Parameters:
- a value
- b value
- div (a, b)
-
divide first value by second /
Parameters:
- a value
- b value
- pow (a, b)
-
raise first to the power of second ^
Parameters:
- a value
- b value
- mod (a, b)
-
modulo; remainder of a divided by b %
Parameters:
- a value
- b value
- concat (a, b)
-
concatenate two values (either strings or
__concatdefined) ..Parameters:
- a value
- b value
- unm (a)
-
return the negative of a value -
Parameters:
- a value
- lnot (a)
-
false if value evaluates as true not
Parameters:
- a value
- land (a, b)
-
true if both values evaluate as true and
Parameters:
- a value
- b value
- lor (a, b)
-
true if either value evaluate as true or
Parameters:
- a value
- b value
- table (...)
-
make a table from the arguments {}
Parameters:
- ... non-nil arguments
Returns:
-
a table
- match (a, b)
-
match two strings ~.
uses string.find
Parameters:
- a
- b
- nop (...)
-
the null operation.
Parameters:
- ... arguments
Returns:
-
the arguments