I'm not 100% clear as to the cause (might be worth filing an issue in the purrr repo on this), but just to elucidate a bit more here's a reprex with output…
library(tidyverse)
geom_names <- apropos("^Geom", ignore.case = FALSE)
geoms <- mget(geom_names, env = asNamespace("ggplot2"))
aes_list <- lapply(geoms, function(x) x$default_aes)
aes_list2 <- map(geoms, 'default_aes')
aes_list3 <- map(geoms, `[[`, 'default_aes')
all.equal(aes_list, aes_list2)
#> [1] "Component \"Geom\": Modes: list, NULL"
#> [2] "Component \"Geom\": Attributes: < Modes: list, NULL >"
#> [3] "Component \"Geom\": Attributes: < Lengths: 2, 0 >"
#> [4] "Component \"Geom\": Attributes: < names for target but not for current >"
#> [5] "Component \"Geom\": Attributes: < current is not list-like >"
#> [6] "Component \"Geom\": current is not list-like"
#> [7] "Component \"GeomAnnotationMap\": Modes: list, NULL"
#> [8] "Component \"GeomAnnotationMap\": Lengths: 6, 0"
#> [9] "Component \"GeomAnnotationMap\": names for target but not for current"
#> [10] "Component \"GeomAnnotationMap\": Attributes: < Modes: list, NULL >"
#> [11] "Component \"GeomAnnotationMap\": Attributes: < Lengths: 1, 0 >"
#> [12] "Component \"GeomAnnotationMap\": Attributes: < names for target but not for current >"
#> [13] "Component \"GeomAnnotationMap\": Attributes: < current is not list-like >"
#> [14] "Component \"GeomAnnotationMap\": current is not list-like"
#> [15] "Component \"GeomBar\": Modes: list, NULL"
#> [16] "Component \"GeomBar\": Lengths: 5, 0"
#> [17] "Component \"GeomBar\": names for target but not for current"
#> [18] "Component \"GeomBar\": Attributes: < Modes: list, NULL >"
#> [19] "Component \"GeomBar\": Attributes: < Lengths: 1, 0 >"
#> [20] "Component \"GeomBar\": Attributes: < names for target but not for current >"
#> [21] "Component \"GeomBar\": Attributes: < current is not list-like >"
#> [22] "Component \"GeomBar\": current is not list-like"
#> [23] "Component \"GeomBlank\": Modes: list, NULL"
#> [24] "Component \"GeomBlank\": Attributes: < Modes: list, NULL >"
#> [25] "Component \"GeomBlank\": Attributes: < Lengths: 2, 0 >"
#> [26] "Component \"GeomBlank\": Attributes: < names for target but not for current >"
#> [27] "Component \"GeomBlank\": Attributes: < current is not list-like >"
#> [28] "Component \"GeomBlank\": current is not list-like"
#> [29] "Component \"GeomCol\": Modes: list, NULL"
#> [30] "Component \"GeomCol\": Lengths: 5, 0"
#> [31] "Component \"GeomCol\": names for target but not for current"
#> [32] "Component \"GeomCol\": Attributes: < Modes: list, NULL >"
#> [33] "Component \"GeomCol\": Attributes: < Lengths: 1, 0 >"
#> [34] "Component \"GeomCol\": Attributes: < names for target but not for current >"
#> [35] "Component \"GeomCol\": Attributes: < current is not list-like >"
#> [36] "Component \"GeomCol\": current is not list-like"
#> [37] "Component \"GeomLine\": Modes: list, NULL"
#> [38] "Component \"GeomLine\": Lengths: 4, 0"
#> [39] "Component \"GeomLine\": names for target but not for current"
#> [40] "Component \"GeomLine\": Attributes: < Modes: list, NULL >"
#> [41] "Component \"GeomLine\": Attributes: < Lengths: 1, 0 >"
#> [42] "Component \"GeomLine\": Attributes: < names for target but not for current >"
#> [43] "Component \"GeomLine\": Attributes: < current is not list-like >"
#> [44] "Component \"GeomLine\": current is not list-like"
#> [45] "Component \"GeomMap\": Modes: list, NULL"
#> [46] "Component \"GeomMap\": Lengths: 6, 0"
#> [47] "Component \"GeomMap\": names for target but not for current"
#> [48] "Component \"GeomMap\": Attributes: < Modes: list, NULL >"
#> [49] "Component \"GeomMap\": Attributes: < Lengths: 1, 0 >"
#> [50] "Component \"GeomMap\": Attributes: < names for target but not for current >"
#> [51] "Component \"GeomMap\": Attributes: < current is not list-like >"
#> [52] "Component \"GeomMap\": current is not list-like"
#> [53] "Component \"GeomRasterAnn\": Modes: list, NULL"
#> [54] "Component \"GeomRasterAnn\": Attributes: < Modes: list, NULL >"
#> [55] "Component \"GeomRasterAnn\": Attributes: < Lengths: 2, 0 >"
#> [56] "Component \"GeomRasterAnn\": Attributes: < names for target but not for current >"
#> [57] "Component \"GeomRasterAnn\": Attributes: < current is not list-like >"
#> [58] "Component \"GeomRasterAnn\": current is not list-like"
#> [59] "Component \"GeomSpoke\": Modes: list, NULL"
#> [60] "Component \"GeomSpoke\": Lengths: 4, 0"
#> [61] "Component \"GeomSpoke\": names for target but not for current"
#> [62] "Component \"GeomSpoke\": Attributes: < Modes: list, NULL >"
#> [63] "Component \"GeomSpoke\": Attributes: < Lengths: 1, 0 >"
#> [64] "Component \"GeomSpoke\": Attributes: < names for target but not for current >"
#> [65] "Component \"GeomSpoke\": Attributes: < current is not list-like >"
#> [66] "Component \"GeomSpoke\": current is not list-like"
#> [67] "Component \"GeomStep\": Modes: list, NULL"
#> [68] "Component \"GeomStep\": Lengths: 4, 0"
#> [69] "Component \"GeomStep\": names for target but not for current"
#> [70] "Component \"GeomStep\": Attributes: < Modes: list, NULL >"
#> [71] "Component \"GeomStep\": Attributes: < Lengths: 1, 0 >"
#> [72] "Component \"GeomStep\": Attributes: < names for target but not for current >"
#> [73] "Component \"GeomStep\": Attributes: < current is not list-like >"
#> [74] "Component \"GeomStep\": current is not list-like"
all.equal(aes_list, aes_list3)
#> [1] TRUE
str(aes_list)
#> List of 43
#> $ Geom : Named list()
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomAbline :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomAnnotationMap:List of 6
#> ..$ colour : chr "NA"
#> ..$ fill : chr "grey20"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..$ subgroup: NULL
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomArea :List of 5
#> ..$ colour : logi NA
#> ..$ fill : chr "grey20"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomBar :List of 5
#> ..$ colour : logi NA
#> ..$ fill : chr "grey35"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomBlank : Named list()
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomBoxplot :List of 7
#> ..$ weight : num 1
#> ..$ colour : chr "grey20"
#> ..$ fill : chr "white"
#> ..$ size : num 0.5
#> ..$ alpha : logi NA
#> ..$ shape : num 19
#> ..$ linetype: chr "solid"
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomCol :List of 5
#> ..$ colour : logi NA
#> ..$ fill : chr "grey35"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomContour :List of 5
#> ..$ weight : num 1
#> ..$ colour : chr "#3366FF"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomCrossbar :List of 5
#> ..$ colour : chr "black"
#> ..$ fill : logi NA
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomCurve :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomCustomAnn :List of 4
#> ..$ xmin: num -Inf
#> ..$ xmax: num Inf
#> ..$ ymin: num -Inf
#> ..$ ymax: num Inf
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomDensity :List of 6
#> ..$ fill : logi NA
#> ..$ weight : num 1
#> ..$ colour : chr "black"
#> ..$ alpha : logi NA
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> $ GeomDensity2d :List of 4
#> ..$ colour : chr "#3366FF"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomDotplot :List of 5
#> ..$ colour : chr "black"
#> ..$ fill : chr "black"
#> ..$ alpha : logi NA
#> ..$ stroke : num 1
#> ..$ linetype: chr "solid"
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomErrorbar :List of 5
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ width : num 0.5
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomErrorbarh :List of 5
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ height : num 0.5
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomHex :List of 5
#> ..$ colour : logi NA
#> ..$ fill : chr "grey50"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomHline :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomLabel :List of 10
#> ..$ colour : chr "black"
#> ..$ fill : chr "white"
#> ..$ size : num 3.88
#> ..$ angle : num 0
#> ..$ hjust : num 0.5
#> ..$ vjust : num 0.5
#> ..$ alpha : logi NA
#> ..$ family : chr ""
#> ..$ fontface : num 1
#> ..$ lineheight: num 1.2
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomLine :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomLinerange :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomLogticks :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : num 1
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomMap :List of 6
#> ..$ colour : chr "NA"
#> ..$ fill : chr "grey20"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..$ subgroup: NULL
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomPath :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomPoint :List of 6
#> ..$ shape : num 19
#> ..$ colour: chr "black"
#> ..$ size : num 1.5
#> ..$ fill : logi NA
#> ..$ alpha : logi NA
#> ..$ stroke: num 0.5
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomPointrange :List of 7
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ shape : num 19
#> ..$ fill : logi NA
#> ..$ alpha : logi NA
#> ..$ stroke : num 1
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomPolygon :List of 6
#> ..$ colour : chr "NA"
#> ..$ fill : chr "grey20"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..$ subgroup: NULL
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomQuantile :List of 5
#> ..$ weight : num 1
#> ..$ colour : chr "#3366FF"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> $ GeomRaster :List of 2
#> ..$ fill : chr "grey20"
#> ..$ alpha: logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomRasterAnn : Named list()
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomRect :List of 5
#> ..$ colour : logi NA
#> ..$ fill : chr "grey35"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomRibbon :List of 5
#> ..$ colour : logi NA
#> ..$ fill : chr "grey20"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomRug :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomSegment :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomSf :List of 7
#> ..$ shape : NULL
#> ..$ colour : NULL
#> ..$ fill : NULL
#> ..$ size : NULL
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..$ stroke : num 0.5
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomSmooth :List of 6
#> ..$ colour : chr "#3366FF"
#> ..$ fill : chr "grey60"
#> ..$ size : num 1
#> ..$ linetype: num 1
#> ..$ weight : num 1
#> ..$ alpha : num 0.4
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomSpoke :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomStep :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomText :List of 9
#> ..$ colour : chr "black"
#> ..$ size : num 3.88
#> ..$ angle : num 0
#> ..$ hjust : num 0.5
#> ..$ vjust : num 0.5
#> ..$ alpha : logi NA
#> ..$ family : chr ""
#> ..$ fontface : num 1
#> ..$ lineheight: num 1.2
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomTile :List of 7
#> ..$ fill : chr "grey20"
#> ..$ colour : logi NA
#> ..$ size : num 0.1
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..$ width : logi NA
#> ..$ height : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomViolin :List of 6
#> ..$ weight : num 1
#> ..$ colour : chr "grey20"
#> ..$ fill : chr "white"
#> ..$ size : num 0.5
#> ..$ alpha : logi NA
#> ..$ linetype: chr "solid"
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomVline :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
str(aes_list2)
#> List of 43
#> $ Geom : NULL
#> $ GeomAbline :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomAnnotationMap: NULL
#> $ GeomArea :List of 5
#> ..$ colour : logi NA
#> ..$ fill : chr "grey20"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomBar : NULL
#> $ GeomBlank : NULL
#> $ GeomBoxplot :List of 7
#> ..$ weight : num 1
#> ..$ colour : chr "grey20"
#> ..$ fill : chr "white"
#> ..$ size : num 0.5
#> ..$ alpha : logi NA
#> ..$ shape : num 19
#> ..$ linetype: chr "solid"
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomCol : NULL
#> $ GeomContour :List of 5
#> ..$ weight : num 1
#> ..$ colour : chr "#3366FF"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomCrossbar :List of 5
#> ..$ colour : chr "black"
#> ..$ fill : logi NA
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomCurve :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomCustomAnn :List of 4
#> ..$ xmin: num -Inf
#> ..$ xmax: num Inf
#> ..$ ymin: num -Inf
#> ..$ ymax: num Inf
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomDensity :List of 6
#> ..$ fill : logi NA
#> ..$ weight : num 1
#> ..$ colour : chr "black"
#> ..$ alpha : logi NA
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> $ GeomDensity2d :List of 4
#> ..$ colour : chr "#3366FF"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomDotplot :List of 5
#> ..$ colour : chr "black"
#> ..$ fill : chr "black"
#> ..$ alpha : logi NA
#> ..$ stroke : num 1
#> ..$ linetype: chr "solid"
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomErrorbar :List of 5
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ width : num 0.5
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomErrorbarh :List of 5
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ height : num 0.5
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomHex :List of 5
#> ..$ colour : logi NA
#> ..$ fill : chr "grey50"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomHline :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomLabel :List of 10
#> ..$ colour : chr "black"
#> ..$ fill : chr "white"
#> ..$ size : num 3.88
#> ..$ angle : num 0
#> ..$ hjust : num 0.5
#> ..$ vjust : num 0.5
#> ..$ alpha : logi NA
#> ..$ family : chr ""
#> ..$ fontface : num 1
#> ..$ lineheight: num 1.2
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomLine : NULL
#> $ GeomLinerange :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomLogticks :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : num 1
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomMap : NULL
#> $ GeomPath :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomPoint :List of 6
#> ..$ shape : num 19
#> ..$ colour: chr "black"
#> ..$ size : num 1.5
#> ..$ fill : logi NA
#> ..$ alpha : logi NA
#> ..$ stroke: num 0.5
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomPointrange :List of 7
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ shape : num 19
#> ..$ fill : logi NA
#> ..$ alpha : logi NA
#> ..$ stroke : num 1
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomPolygon :List of 6
#> ..$ colour : chr "NA"
#> ..$ fill : chr "grey20"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..$ subgroup: NULL
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomQuantile :List of 5
#> ..$ weight : num 1
#> ..$ colour : chr "#3366FF"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> $ GeomRaster :List of 2
#> ..$ fill : chr "grey20"
#> ..$ alpha: logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomRasterAnn : NULL
#> $ GeomRect :List of 5
#> ..$ colour : logi NA
#> ..$ fill : chr "grey35"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomRibbon :List of 5
#> ..$ colour : logi NA
#> ..$ fill : chr "grey20"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomRug :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomSegment :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomSf :List of 7
#> ..$ shape : NULL
#> ..$ colour : NULL
#> ..$ fill : NULL
#> ..$ size : NULL
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..$ stroke : num 0.5
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomSmooth :List of 6
#> ..$ colour : chr "#3366FF"
#> ..$ fill : chr "grey60"
#> ..$ size : num 1
#> ..$ linetype: num 1
#> ..$ weight : num 1
#> ..$ alpha : num 0.4
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomSpoke : NULL
#> $ GeomStep : NULL
#> $ GeomText :List of 9
#> ..$ colour : chr "black"
#> ..$ size : num 3.88
#> ..$ angle : num 0
#> ..$ hjust : num 0.5
#> ..$ vjust : num 0.5
#> ..$ alpha : logi NA
#> ..$ family : chr ""
#> ..$ fontface : num 1
#> ..$ lineheight: num 1.2
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomTile :List of 7
#> ..$ fill : chr "grey20"
#> ..$ colour : logi NA
#> ..$ size : num 0.1
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..$ width : logi NA
#> ..$ height : logi NA
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomViolin :List of 6
#> ..$ weight : num 1
#> ..$ colour : chr "grey20"
#> ..$ fill : chr "white"
#> ..$ size : num 0.5
#> ..$ alpha : logi NA
#> ..$ linetype: chr "solid"
#> ..- attr(*, "class")= chr "uneval"
#> $ GeomVline :List of 4
#> ..$ colour : chr "black"
#> ..$ size : num 0.5
#> ..$ linetype: num 1
#> ..$ alpha : logi NA
#> ..- attr(*, "class")= chr "uneval"
Created on 2019-07-15 by the reprex package (v0.3.0)
Right from the top when I run str(aes_list)
and str(aes_list2)
there's a difference in that the former gives (excerpting here):
str(aes_list)
#> List of 43
#> $ Geom : Named list()
#> ..- attr(*, "class")= chr "uneval"
while the latter:
str(aes_list2)
#> List of 43
#> $ Geom : NULL
From the map()
docs:
If .x
has names()
, the return value preserves those names.
which it does, but it's not capturing the next level of Geom
as a named list (this is where I'm unsure about the expected behavior).
geoms$Geom
#> <ggproto object: Class Geom, gg>
#> aesthetics: function
#> default_aes: uneval
#> draw_group: function
#> draw_key: function
#> draw_layer: function
#> draw_panel: function
#> extra_params: na.rm
#> handle_na: function
#> non_missing_aes:
#> optional_aes:
#> parameters: function
#> required_aes:
#> setup_data: function
#> use_defaults: function