# 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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