dt_starts_with: Select helpers

In tidyfast: Fast Tidying of Data

Description

These functions allow you to select variables based on their names.

• dt_starts_with(): Starts with a prefix

• dt_starts_with(): Ends with a suffix

• dt_contains(): Contains a literal string

• dt_everything(): Matches all variables

Usage

dt_starts_with(match)

dt_contains(match)

dt_ends_with(match)

dt_everything()

Arguments

match

a character string to match to variable names

Value

None. To be used within the dt_pivot_* functions.

Examples

library(data.table)

# example of using it with `dt_pivot_longer()`
df <- data.table(row = 1, var = c("x", "y"), a = 1:2, b = 3:4)
pv <- dt_pivot_wider(df,
                     names_from = var,
                     values_from = c(dt_starts_with("a"), dt_ends_with("b")))

tidyfast documentation built on March 20, 2020, 5:08 p.m.