maths: Math operations

In ropensci/jqr: Client for 'jq', a 'JSON' Processor

Math operations

Description

Math operations

Usage

do(.data, ...)

do_(.data, ..., .dots)

lengthj(.data)

sqrtj(.data)

floorj(.data)

minj(.data, ...)

minj_(.data, ..., .dots)

maxj(.data, ...)

maxj_(.data, ..., .dots)

ad(.data)

map(.data, ...)

map_(.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

# do math
jq('{"a": 7}', '.a + 1')
# adding null gives back same result
jq('{"a": 7}', '.a + null')
jq('{"a": 7}', '.a += 1')
'{"a": 7}' %>%  do(.a + 1)
# '{"a": 7}' %>%  do(.a += 1) # this doesn't work quite yet
'{"a": [1,2], "b": [3,4]}' %>%  do(.a + .b)
'{"a": [1,2], "b": [3,4]}' %>%  do(.a - .b)
'{"a": 3}' %>%  do(4 - .a)
'["xml", "yaml", "json"]' %>%  do('. - ["xml", "yaml"]')
'5' %>%  do(10 / . * 3)
## many JSON inputs
'{"a": [1,2], "b": [3,4]} {"a": [1,5], "b": [3,10]}' %>%  do(.a + .b)

# comparisons
'[5,4,2,7]' %>% index() %>% do(. < 4)
'[5,4,2,7]' %>% index() %>% do(. > 4)
'[5,4,2,7]' %>% index() %>% do(. <= 4)
'[5,4,2,7]' %>% index() %>% do(. >= 4)
'[5,4,2,7]' %>% index() %>% do(. == 4)
'[5,4,2,7]' %>% index() %>% do(. != 4)
## many JSON inputs
'[5,4,2,7] [4,3,200,0.1]' %>% index() %>% do(. < 4)

# length
'[[1,2], "string", {"a":2}, null]' %>% index %>% lengthj

# sqrt
'9' %>% sqrtj
## many JSON inputs
'9 4 5' %>% sqrtj

# floor
'3.14159' %>% floorj
## many JSON inputs
'3.14159 30.14 45.9' %>% floorj

# find minimum
'[5,4,2,7]' %>% minj
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% minj
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% minj(foo)
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% minj(bar)
## many JSON inputs
'[{"foo":1}, {"foo":14}] [{"foo":2}, {"foo":3}]' %>% minj(foo)

# find maximum
'[5,4,2,7]' %>% maxj
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% maxj
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% maxj(foo)
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% maxj(bar)
## many JSON inputs
'[{"foo":1}, {"foo":14}] [{"foo":2}, {"foo":3}]' %>% maxj(foo)

# increment values
## requires special % operators, they get escaped internally
'{"foo": 1}' %>% do(.foo %+=% 1)
'{"foo": 1}' %>% do(.foo %-=% 1)
'{"foo": 1}' %>% do(.foo %*=% 4)
'{"foo": 1}' %>% do(.foo %/=% 10)
'{"foo": 1}' %>% do(.foo %//=% 10)
### fix me - %= doesn't work
# '{"foo": 1}' %>% do(.foo %%=% 10)
## many JSON inputs
'{"foo": 1} {"foo": 2} {"foo": 3}' %>% do(.foo %+=% 1)

# add
'["a","b","c"]' %>% ad
'[1, 2, 3]' %>% ad
'[]' %>% ad
## many JSON inputs
'["a","b","c"] ["d","e","f"]' %>% ad

# map
## as far as I know, this only works with numbers, thus it's
## in the maths section
'[1, 2, 3]' %>% map(.+1)
'[1, 2, 3]' %>% map(./1)
'[1, 2, 3]' %>% map(.*4)
# many JSON inputs
'[1, 2, 3] [100, 200, 300] [1000, 2000, 30000]' %>% map(.+1)

ropensci/jqr documentation built on Jan. 19, 2024, 8:33 p.m.