What is the difference between require() and library()?

Question

Can someone tell me the difference between require() and library() in R? Select the correct answer from above options Hadoop questions and answers, Hive questions pdf, Hadoop question bank, Hadoop questions and answers pdf, mcq on Hadoop pdf,Hadoop questions and solutions, Hadoop mcq Test , Interview Hadoop questions, Hadoop Questions for Interview, Hadoop MCQ (Multiple Choice Questions),Core Hadoop Questions, Core Hadoop MCQ,core Hadoop interview questions for experienced

Answer 1

require() is used inside the function and it outputs a warning and if the package is not found it continues whereas library() will show an error. They aren’t that useful in day to day work, I am attaching examples of both below: Library(): > test <- library("qwe") Error in library("qwe") : there is no package called 'abc' > test Error: object 'test' not found > test <- require("qwe") Loading required package: abc Warning message: In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE, : there is no package called 'abc' > test [1] FALSE require(): if(require("lme3")) { print("lme3 is loaded correctly") } else { print("trying to install lme3") install.packages("lme3") if(require(lme3)){ print("lme3 installed and loaded") } else { stop("could not install lme3") } } For any doubts comment down below.