What is lapply() function in R?

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With example

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Xtramous 55 years 2 Answers 836 views Contributor 0

Answers ( 2 )

  1. Dhruv2301
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    If the programmers want the output to be a list, then lapply() function is used.
    Eg:
    movies <- c("SPYDERMAN","BATMAN","VERTIGO","CHINATOWN")
    movies_lower <-lapply(movies, tolower)
    str(movies_lower)
    OUTPUT:
    ## List of 4
    ## $:chr"spyderman"
    ## $:chr"batman"
    ## $:chr"vertigo"
    ## $:chr"chinatown"

  2. Shubham Bhatt
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    lapply() function is useful for performing operations on list objects and returns a list object of same length of original set. lappy() returns a list of the similar length as input list object, each element of which is the result of applying function to the corresponding element of list. lapply() takes list, vector or data frame as input and gives output in list.
    l in lapply() stands for list.
    friends <- c("SHUBH","RIYA","ADITI","BAHAAR")
    friends_lower <-lapply(friends, tolower)
    str(friends_lower)
    Output:

    ## List of 4
    ## $:chr"shubh"
    ## $:chr"riya"
    ## $:chr"aditi"
    ## $:chr"bahaar"

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