# glue: Format and interpolate a string In glue: Interpreted String Literals

## Description

Expressions enclosed by braces will be evaluated as R code. Long strings are broken by line and concatenated together. Leading whitespace and blank lines from the first and last lines are automatically trimmed.

## Usage

  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 glue_data( .x, ..., .sep = "", .envir = parent.frame(), .open = "{", .close = "}", .na = "NA", .transformer = identity_transformer, .trim = TRUE ) glue( ..., .sep = "", .envir = parent.frame(), .open = "{", .close = "}", .na = "NA", .transformer = identity_transformer, .trim = TRUE ) 

## Arguments

 .x [listish] An environment, list or data frame used to lookup values. ... [expressions] Unnamed arguments are taken to be expressions string(s) to format. Multiple inputs are concatenated together before formatting. Named arguments are taken to be temporary variables available for substitution. .sep [character(1): ‘""’] Separator used to separate elements. .envir [environment: parent.frame()] Environment to evaluate each expression in. Expressions are evaluated from left to right. If .x is an environment, the expressions are evaluated in that environment and .envir is ignored. If NULL is passed it is equivalent to emptyenv(). .open [character(1): ‘\{’] The opening delimiter. Doubling the full delimiter escapes it. .close [character(1): ‘\}’] The closing delimiter. Doubling the full delimiter escapes it. .na [character(1): ‘NA’] Value to replace NA values with. If NULL missing values are propagated, that is an NA result will cause NA output. Otherwise the value is replaced by the value of .na. .transformer [function] A function taking three parameters code, envir and data used to transform the output of each block before during or after evaluation. For example transformers see vignette("transformers"). .trim [logical(1): ‘TRUE’] Whether to trim the input template with trim() or not.

  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 name <- "Fred" age <- 50 anniversary <- as.Date("1991-10-12") glue('My name is {name},', 'my age next year is {age + 1},', 'my anniversary is {format(anniversary, "%A, %B %d, %Y")}.') # single braces can be inserted by doubling them glue("My name is {name}, not {{name}}.") # Named arguments can be used to assign temporary variables. glue('My name is {name},', ' my age next year is {age + 1},', ' my anniversary is {format(anniversary, "%A, %B %d, %Y")}.', name = "Joe", age = 40, anniversary = as.Date("2001-10-12")) # glue() can also be used in user defined functions intro <- function(name, profession, country){ glue("My name is {name}, a {profession}, from {country}") } intro("Shelmith", "Senior Data Analyst", "Kenya") intro("Cate", "Data Scientist", "Kenya") # glue_data() is useful in magrittr pipes library(magrittr) mtcars %>% glue_data("{rownames(.)} has {hp} hp") # Or within dplyr pipelines library(dplyr) head(iris) %>% mutate(description = glue("This {Species} has a petal length of {Petal.Length}")) # Alternative delimiters can also be used if needed one <- "1" glue("The value of $e^{2\\pi i}$ is $<>$.", .open = "<<", .close = ">>")