In ropensci/lq: List Queries

lq

knitr::opts_chunk$set(
  comment = "#>",
  collapse = TRUE,
  warning = FALSE,
  message = FALSE
)

List queries

leveraging jqr, an R interface to jq, a JSON processor http://stedolan.github.io/jq/

Installation

remotes::install_github("ropensci/lq")

library(lq)

Interfaces

low level

(x <- list(a = list(b = list(c = 1, d = 2, e = 3)), f = 45))

lq(x, ".[][] | keys | reverse")

high level

library(jqr)
(tj(x) %>% index()) %>% fj
(tj(x) %>% index() %>% index()) %>% fj
(tj(x) %>% index() %>% index() %>% select(. > 2)) %>% fj
(tj(x) %>% index() %>% select(. > 2)) %>% fj
(tj(x) %>% index() %>% index() %>% keys() %>% reverse) %>% fj

TODO

• make hooks like in jqr so that we automatigically convert json back to list instead of needing fj() at the end of a high level DSL workflow
• similarly, make tj() unneccesary
• other smart things with lists ... 😏

Meta

• Please report any issues or bugs.
• License: MIT
• Get citation information for lq in R doing citation(package = 'lq')
• Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

ropensci/lq documentation built on May 14, 2022, 5:07 p.m.