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Which function is difficult to implement?

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Which function is difficult to implement? (a) Lapply (b) Japply (c) Vapply (d) Zapply I have been asked this question at a job interview. I'm obligated to ask this question of Functions in portion Control Structures, Functions, Scoping Rules, Loop Functions and Debugging of R Programming Select the correct answer from above options

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The correct option is (c) Vapply Easy explanation: Vapply allows the programmer to specific the output type. The disadvantage of using vapply is that it is very difficult to be implemented and more verbose. vapply is similar to sapply, but has a pre-specified type of return value, so it can be safer to use.

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