# can pluck/chuck from NULL
Code
chuck(NULL, 1)
Condition
Error in `chuck()`:
! Can't pluck from NULL at level 1.
# unsupported types have useful error
Code
pluck(quote(x), 1)
Condition
Error in `pluck_raw()`:
! Can't pluck from a symbol at level 1.
Code
pluck(quote(f(x, 1)), 1)
Condition
Error in `pluck_raw()`:
! Can't pluck from a call at level 1.
Code
pluck(expression(1), 1)
Condition
Error in `pluck_raw()`:
! Can't pluck from an expression vector at level 1.
# dots must be unnamed
Code
pluck(1, a = 1)
Condition
Error in `pluck()`:
! Arguments in `...` must be passed by position, not name.
x Problematic argument:
* a = 1
---
Code
chuck(1, a = 1)
Condition
Error in `chuck()`:
! Arguments in `...` must be passed by position, not name.
x Problematic argument:
* a = 1
# can pluck by position (positive and negative)
Code
chuck(x, 0)
Condition
Error in `chuck()`:
! Index 1 is zero.
---
Code
chuck(x, 4)
Condition
Error in `chuck()`:
! Index 1 exceeds the length of plucked object (4 > 3).
---
Code
chuck(x, -4)
Condition
Error in `chuck()`:
! Index 1 is zero.
---
Code
chuck(x, -5)
Condition
Error in `chuck()`:
! Negative index 1 must be greater than or equal to -3, not -5.
# special numbers don't match
Code
chuck(x, NA_integer_)
Condition
Error in `chuck()`:
! Index 1 must be finite, not NA.
---
Code
chuck(x, NA_real_)
Condition
Error in `chuck()`:
! Index 1 must be finite, not NA.
---
Code
chuck(x, NaN)
Condition
Error in `chuck()`:
! Index 1 must be finite, not NaN.
---
Code
chuck(x, Inf)
Condition
Error in `chuck()`:
! Index 1 must be finite, not Inf.
---
Code
chuck(x, -Inf)
Condition
Error in `chuck()`:
! Index 1 must be finite, not -Inf.
# can pluck by name
Code
chuck(x, "b")
Condition
Error in `chuck()`:
! Can't find name `b` in vector.
---
Code
chuck(x, NA_character_)
Condition
Error in `chuck()`:
! Index 1 can't be NA.
---
Code
chuck(x, "")
Condition
Error in `chuck()`:
! Index 1 can't be an empty string ("").
# even if names don't exist
Code
chuck(x, "a")
Condition
Error in `chuck()`:
! Index 1 is attempting to pluck from an unnamed vector using a string name.
# empty and NA names never match
Code
chuck(x, "")
Condition
Error in `chuck()`:
! Index 1 can't be an empty string ("").
---
Code
chuck(x, NA_character_)
Condition
Error in `chuck()`:
! Index 1 can't be NA.
# require length 1 character/double vectors
Code
pluck(1, 1:2)
Condition
Error in `pluck_raw()`:
! Index 1 must have length 1, not 2.
Code
pluck(1, integer())
Condition
Error in `pluck_raw()`:
! Index 1 must have length 1, not 0.
Code
pluck(1, NULL)
Condition
Error in `pluck_raw()`:
! Index 1 must have length 1, not 0.
Code
pluck(1, TRUE)
Condition
Error in `pluck_raw()`:
! Index 1 must be a character or numeric vector, not `TRUE`.
# validate index even when indexing NULL
Code
pluck(NULL, 1:2)
Condition
Error in `pluck_raw()`:
! Index 1 must have length 1, not 2.
Code
pluck(NULL, TRUE)
Condition
Error in `pluck_raw()`:
! Index 1 must be a character or numeric vector, not `TRUE`.
# accessors throw correct errors
Code
pluck(1:3, function() NULL)
Condition
Error:
! unused argument (1:3)
Code
pluck(1:3, function(x, y) y)
Condition
Error:
! argument "y" is missing, with no default
# can pluck/chuck environment by name
Code
chuck(x, "y")
Condition
Error in `chuck()`:
! Can't find object `y` in environment.
---
Code
chuck(x, NA_character_)
Condition
Error in `chuck()`:
! Index 1 can't be NA.
# environments error with invalid indices
Code
pluck(environment(), 1)
Condition
Error in `pluck_raw()`:
! Index 1 must be a string, not a number.
---
Code
pluck(environment(), letters)
Condition
Error in `pluck_raw()`:
! Index 1 must have length 1, not 26.
# can pluck/chuck from S4 objects
Code
chuck(A, "b")
Condition
Error in `chuck()`:
! Can't find slot `b`.
---
Code
chuck(A, NA_character_)
Condition
Error in `chuck()`:
! Index 1 can't be NA.
# S4 objects error with invalid indices
Code
pluck(A, 1)
Condition
Error in `pluck_raw()`:
! Index 1 must be a string, not a number.
---
Code
pluck(A, letters)
Condition
Error in `pluck_raw()`:
! Index 1 must have length 1, not 26.
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