optional parameter - meaning and definition. What is optional parameter
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What (who) is optional parameter - definition

Named parameters; Keyword argument; Keyword arguments; Named arguments; Optional parameter; Positional parameter; Unnamed parameter; Positional argument

Named parameter         
In computer programming, named parameters, named argument or keyword arguments refer to a computer language's support for function calls that clearly state the name of each parameter within the function call.
Parameter (computer programming)         
IN COMPUTER PROGRAMMING, SPECIAL KIND OF VARIABLE THAT HOLDS DATA THAT WAS PASSED AS AN ARGUMENT TO A SUBROUTINE
Argument (computer science); Argument (programming); Parameter (programming); Formal parameter; Actual parameter; Parameters (computer science); Formal parameters; Function parameter; Argument (computing); Parameter (computer science); Parameter (computing); Output parameter; Out parameter; Return parameter; Argument (computer programming); Input parameter; Input value; Output value; Actual parameters
In computer programming, a parameter or a formal argument is a special kind of variable used in a subroutine to refer to one of the pieces of data provided as input to the subroutine. These pieces of data are the values of the arguments (often called actual arguments or actual parameters) with which the subroutine is going to be called/invoked.
Statistical parameter         
QUANTITY THAT INDEXES A PARAMETRIZED FAMILY OF PROBABILITY DISTRIBUTIONS
Numerical parameter; Population parameter; Statistical measure; Numeric parameter; Statistical parameters; True value
In statistics, as opposed to its general use in mathematics, a parameter is any measured quantity of a statistical population that summarises or describes an aspect of the population, such as a mean or a standard deviation. If a population exactly follows a known and defined distribution, for example the normal distribution, then a small set of parameters can be measured which completely describes the population, and can be considered to define a probability distribution for the purposes of extracting samples from this population.

Wikipedia

Named parameter

In computer programming, named parameters, named-parameter arguments, named arguments or keyword arguments refer to a computer language's support for function calls to clearly associate each argument with a given parameter parameter within the function call.