Chapter 6 Working with Strings

First load the package.

library(stringr)

6.1 String combine with `str_c`

our_string = c("With", "great", "power", "comes", "great", "responsibility")

str_length(our_string)

## [1]  4  5  5  5  5 14

str_c("Hello", "World", sep = " ")

## [1] "Hello World"

str_c(our_string)

## [1] "With"           "great"          "power"          "comes"         
## [5] "great"          "responsibility"

str_c(our_string,  collapse = " ")

## [1] "With great power comes great responsibility"

str_sub(our_string, 1, 1)

## [1] "W" "g" "p" "c" "g" "r"

str_sub(our_string, 1, 2)

## [1] "Wi" "gr" "po" "co" "gr" "re"

str_sub(our_string, -1, -1)

## [1] "h" "t" "r" "s" "t" "y"

str_sub(our_string, -2, -1)

## [1] "th" "at" "er" "es" "at" "ty"

str_to_lower(our_string)

## [1] "with"           "great"          "power"          "comes"         
## [5] "great"          "responsibility"

str_to_upper(our_string)

## [1] "WITH"           "GREAT"          "POWER"          "COMES"         
## [5] "GREAT"          "RESPONSIBILITY"

str_to_title(our_string)

## [1] "With"           "Great"          "Power"          "Comes"         
## [5] "Great"          "Responsibility"

# specify locale to be sure that behavior is consistent with locale option
str_to_title(our_string, locale = "en")

## [1] "With"           "Great"          "Power"          "Comes"         
## [5] "Great"          "Responsibility"

# capitalize first letter
str_sub(our_string, 1, 1) <- str_to_upper(str_sub(our_string, 1, 1))
our_string

## [1] "With"           "Great"          "Power"          "Comes"         
## [5] "Great"          "Responsibility"

str_sort(our_string)

## [1] "Comes"          "Great"          "Great"          "Power"         
## [5] "Responsibility" "With"

another_string = c(NA, "Hello", "World")
str_c(another_string, collapse = " ")

## [1] NA