str_glue {stringr}

Interpolation with glue

Description

These functions are wrappers around glue::glue() and glue::glue_data(), which provide a powerful and elegant syntax for interpolating strings with {}.

These wrappers provide a small set of the full options. Use glue() and glue_data() directly from glue for more control.

Usage

str_glue(..., .sep = "", .envir = parent.frame())

str_glue_data(.x, ..., .sep = "", .envir = parent.frame(), .na = "NA")

Arguments

...

[expressions]
Unnamed arguments are taken to be expression 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().

.x

[listish]
An environment, list, or data frame used to lookup values.

.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.

Value

A character vector with same length as the longest input.

Examples

name <- "Fred"
age <- 50
anniversary <- as.Date("1991-10-12")
str_glue(
  "My name is {name}, ",
  "my age next year is {age + 1}, ",
  "and my anniversary is {format(anniversary, '%A, %B %d, %Y')}."
)

# single braces can be inserted by doubling them
str_glue("My name is {name}, not {{name}}.")

# You can also used named arguments
str_glue(
  "My name is {name}, ",
  "and my age next year is {age + 1}.",
  name = "Joe",
  age = 40
)

# `str_glue_data()` is useful in data pipelines
mtcars %>% str_glue_data("{rownames(.)} has {hp} hp")