Question

Point out the correct statement?

(a) An environment is a collection of (symbol, value) pairs, i.e. x is a symbol and 3.14 might be its value

(b) If the value of a symbol is not found in the environment in which a function was defined, then the search is continued in the child environment

(c) After the top-level environment, the search continues down the search list until we hit the parent environment

(d) Dynamic scoping turns out to be particularly useful for simplifying statistical computations

This question was addressed to me in homework.

This interesting question is from Scoping Rules topic in division Control Structures, Functions, Scoping Rules, Loop Functions and Debugging of R Programming

Answer 1

Correct choice is (a) An environment is a collection of (symbol, value) pairs, i.e. x is a symbol and 3.14 might be its value

The explanation is: Every environment has a parent environment and it is possible for an environment to have multiple “children”.