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  • 1

    Conditionals and Control Flow

    Free

    In this chapter, you'll learn about relational operators for comparing R objects, and logical operators like "and" and "or" for combining TRUE and FALSE values. Then, you'll use this knowledge to build conditional statements.

  • 2

    Loops

    Loops can come in handy on numerous occasions. While loops are like repeated if statements, the for loop is designed to iterate over all elements in a sequence. Learn about them in this chapter.

  • 3

    Functions

    Functions are an extremely important concept in almost every programming language, and R is no different. Learn what functions are and how to use them—then take charge by writing your own functions.

  • 4

    The apply family

    Whenever you're using a for loop, you may want to revise your code to see whether you can use the lapply function instead. Learn all about this intuitive way of applying a function over a list or a vector, and how to use its variants, sapply and vapply.

  • 5

    Utilities

    Mastering R programming is not only about understanding its programming concepts. Having a solid understanding of a wide range of R functions is also important. This chapter introduces you to many useful functions for data structure manipulation, regular expressions, and working with times and dates.

Initializing

Exercise

Next, you break it

A possible solution to the previous exercise has been provided for you. The code loops over the linkedin vector and prints out different messages depending on the values of li.

In this exercise, you will use the break and next statements:

  • The break statement abandons the active loop: the remaining code in the loop is skipped and the loop is not iterated over anymore.
  • The next statement skips the remainder of the code in the loop, but continues the iteration.

Instructions

100 XP

Extend the for loop with two new, separate if tests as follows:

  • If the vector element's value exceeds 16, print out "This is ridiculous, I'm outta here!" and have R abandon the for loop (break).
  • If the value is lower than 5, print out "This is too embarrassing!" and fast-forward to the next iteration (next).