Question

The first component can be accessed using __________ operator.

(a) Intraction

(b) Extraction

(c) AND

(d) OR

This question was posed to me by my college professor while I was bunking the class.

The question is from Data Types in section Nuts and Bolts and Getting Data In and Out of R Programming

Answer 1

Correct choice is (b) Extraction

The best I can explain: There are a number of ways of accessing the first component of a list. We can either access it through the name of that component (if names are assigned) or by using a number corresponding to the position the component corresponds to. The former approach can be performed using subsetting ([[]]) or alternatively, by the extraction operator ($).