keys function

Operations on keys, or by keys

keys takes no input, and retrieves keys. del deletes provided keys. haskey checks if a json string has a key, or the input array has an element at the given index.

keys(.data)

del(.data, ...)

del_(.data, ..., .dots)

haskey(.data, ...)

haskey_(.data, ..., .dots)

Arguments

• .data: input. This can be JSON input, or an object of class jqr that has JSON and query params combined, which is passed from function to function when using the jqr DSL.
• ...: Comma separated list of unquoted variable names
• .dots: Used to work around non-standard evaluation
• dots: dots

Examples

# get keys
str <- '{"foo": 5, "bar": 7}'
jq(str, "keys")
str %>% keys()

# delete by key name
jq(str, "del(.bar)")
str %>% del(bar)

# check for key existence
str3 <- '[[0,1], ["a","b","c"]]'
jq(str3, "map(has(2))")
str3 %>% haskey(2)
jq(str3, "map(has(1,2))")
str3 %>% haskey(1,2)

## many JSON inputs
'{"foo": 5, "bar": 7} {"hello": 5, "world": 7}' %>% keys
'{"foo": 5, "bar": 7} {"hello": 5, "bar": 7}' %>% del(bar)