Joining sf
object with data (3)
left_join(x, y, by = "a")
## Simple feature collection with 2 features and 2 fields
## Geometry type: POINT
## Dimension: XY
## Bounding box: xmin: 0 ymin: 0 xmax: 1 ymax: 1
## CRS: NA
## a letter geom
## 1 1 <NA> POINT (0 0)
## 2 2 k POINT (1 1)