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#' Iterate over property objects in any GeoJSON object
#'
#' @export
#' @param x any [data-GeoJSON] object
#' @param fun a Javascript function. if not given, returns self
#' @template lint
#' @return matrix of coordinates, where each row in the matrix is a
#' coordinate pair
#' @examples
#' x <- "{ type: 'Feature', geometry: null, properties: { foo: 1, bar: 3 } }"
#'
#' # don't apply any function, identity essentially
#' lawn_propeach(x)
#'
#' # appply a function callback
#' lawn_propeach(x, "z.foo === 1")
#'
#' lawn_propeach(lawn_data$points_count)
#'
#' z <- '{
#' "type": "FeatureCollection",
#' "features": [
#' {
#' "type": "Feature",
#' "properties": {
#' "population": 200,
#' "name": "things"
#' },
#' "geometry": {
#' "type": "Point",
#' "coordinates": [-112.0372, 46.608058]
#' }
#' }, {
#' "type": "Feature",
#' "properties": {
#' "population": 600,
#' "name": "stuff"
#' },
#' "geometry": {
#' "type": "Point",
#' "coordinates": [-112.045955, 46.596264]
#' }
#' }
#' ]
#' }'
#' lawn_propeach(z)
#' lawn_propeach(z, "z.population === 200")
#' lawn_propeach(z, "z.name === 'stuff'")
lawn_propeach <- function(x, fun = NULL, lint = FALSE) {
lawnlint(x, lint)
ct$eval(
sprintf("
var peach = [];
turfmeta.propEach(%s, function(z) {
res = %s;
peach.push(res);
});", convert(x), fun %||% 'z'
)
)
as.list(ct$get("peach"))
}
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