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How is a Data object represented internally in R language?

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How is a Data object represented internally in R language? (a) unclass (as.time (“2018-12-28″)) (b) unclass (as.dat (“2018-12-28″)) (c) unclass (as.D (2018-12-28)) (d) unclass (as.Date (“2018-12-28″)) I had been asked this question during an internship interview. This interesting question is from Functions in section Control Structures, Functions, Scoping Rules, Loop Functions and Debugging of R Programming Select the correct answer from above options

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Correct answer is (d) unclass (as.Date (“2018-12-28″)) Explanation: unclass returns (a copy of) its argument with its class information removed. Unclass with an object is to remove from a class or category.

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