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)Examples
# do math
jq('{"a": 7}', '.a + 1')
#> 8
# adding null gives back same result
jq('{"a": 7}', '.a + null')
#> 7
jq('{"a": 7}', '.a += 1')
#> {
#> "a": 8
#> }
'{"a": 7}' %>% do(.a + 1)
#> 8
# '{"a": 7}' %>% do(.a += 1) # this doesn't work quite yet
'{"a": [1,2], "b": [3,4]}' %>% do(.a + .b)
#> [
#> 1,
#> 2,
#> 3,
#> 4
#> ]
'{"a": [1,2], "b": [3,4]}' %>% do(.a - .b)
#> [
#> 1,
#> 2
#> ]
'{"a": 3}' %>% do(4 - .a)
#> 1
'["xml", "yaml", "json"]' %>% do('. - ["xml", "yaml"]')
#> ". - [\"xml\", \"yaml\"]"
'5' %>% do(10 / . * 3)
#> 6
## many JSON inputs
'{"a": [1,2], "b": [3,4]} {"a": [1,5], "b": [3,10]}' %>% do(.a + .b)
#> [
#> [
#> 1,
#> 2,
#> 3,
#> 4
#> ],
#> [
#> 1,
#> 5,
#> 3,
#> 10
#> ]
#> ]
# comparisons
'[5,4,2,7]' %>% index() %>% do(. < 4)
#> [
#> false,
#> false,
#> true,
#> false
#> ]
'[5,4,2,7]' %>% index() %>% do(. > 4)
#> [
#> true,
#> false,
#> false,
#> true
#> ]
'[5,4,2,7]' %>% index() %>% do(. <= 4)
#> [
#> false,
#> true,
#> true,
#> false
#> ]
'[5,4,2,7]' %>% index() %>% do(. >= 4)
#> [
#> true,
#> true,
#> false,
#> true
#> ]
'[5,4,2,7]' %>% index() %>% do(. == 4)
#> [
#> false,
#> true,
#> false,
#> false
#> ]
'[5,4,2,7]' %>% index() %>% do(. != 4)
#> [
#> true,
#> false,
#> true,
#> true
#> ]
## many JSON inputs
'[5,4,2,7] [4,3,200,0.1]' %>% index() %>% do(. < 4)
#> [
#> false,
#> false,
#> true,
#> false,
#> false,
#> true,
#> false,
#> true
#> ]
# length
'[[1,2], "string", {"a":2}, null]' %>% index %>% lengthj
#> [
#> 2,
#> 6,
#> 1,
#> 0
#> ]
# sqrt
'9' %>% sqrtj
#> 3
## many JSON inputs
'9 4 5' %>% sqrtj
#> [
#> 3,
#> 2,
#> 2.23606797749979
#> ]
# floor
'3.14159' %>% floorj
#> 3
## many JSON inputs
'3.14159 30.14 45.9' %>% floorj
#> [
#> 3,
#> 30,
#> 45
#> ]
# find minimum
'[5,4,2,7]' %>% minj
#> 2
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% minj
#> {
#> "foo": 2,
#> "bar": 3
#> }
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% minj(foo)
#> {
#> "foo": 1,
#> "bar": 14
#> }
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% minj(bar)
#> {
#> "foo": 2,
#> "bar": 3
#> }
## many JSON inputs
'[{"foo":1}, {"foo":14}] [{"foo":2}, {"foo":3}]' %>% minj(foo)
#> [
#> {
#> "foo": 1
#> },
#> {
#> "foo": 2
#> }
#> ]
# find maximum
'[5,4,2,7]' %>% maxj
#> 7
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% maxj
#> {
#> "foo": 1,
#> "bar": 14
#> }
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% maxj(foo)
#> {
#> "foo": 2,
#> "bar": 3
#> }
'[{"foo":1, "bar":14}, {"foo":2, "bar":3}]' %>% maxj(bar)
#> {
#> "foo": 1,
#> "bar": 14
#> }
## many JSON inputs
'[{"foo":1}, {"foo":14}] [{"foo":2}, {"foo":3}]' %>% maxj(foo)
#> [
#> {
#> "foo": 14
#> },
#> {
#> "foo": 3
#> }
#> ]
# increment values
## requires special % operators, they get escaped internally
'{"foo": 1}' %>% do(.foo %+=% 1)
#> {
#> "foo": 2
#> }
'{"foo": 1}' %>% do(.foo %-=% 1)
#> {
#> "foo": 0
#> }
'{"foo": 1}' %>% do(.foo %*=% 4)
#> {
#> "foo": 4
#> }
'{"foo": 1}' %>% do(.foo %/=% 10)
#> {
#> "foo": 0.1
#> }
'{"foo": 1}' %>% do(.foo %//=% 10)
#> {
#> "foo": 1
#> }
### fix me - %= doesn't work
# '{"foo": 1}' %>% do(.foo %%=% 10)
## many JSON inputs
'{"foo": 1} {"foo": 2} {"foo": 3}' %>% do(.foo %+=% 1)
#> [
#> {
#> "foo": 2
#> },
#> {
#> "foo": 3
#> },
#> {
#> "foo": 4
#> }
#> ]
# add
'["a","b","c"]' %>% ad
#> "abc"
'[1, 2, 3]' %>% ad
#> 6
'[]' %>% ad
#> null
## many JSON inputs
'["a","b","c"] ["d","e","f"]' %>% ad
#> [
#> "abc",
#> "def"
#> ]
# map
## as far as I know, this only works with numbers, thus it's
## in the maths section
'[1, 2, 3]' %>% map(.+1)
#> [
#> 2,
#> 3,
#> 4
#> ]
'[1, 2, 3]' %>% map(./1)
#> [
#> 1,
#> 2,
#> 3
#> ]
'[1, 2, 3]' %>% map(.*4)
#> [
#> 4,
#> 8,
#> 12
#> ]
# many JSON inputs
'[1, 2, 3] [100, 200, 300] [1000, 2000, 30000]' %>% map(.+1)
#> [
#> [
#> 2,
#> 3,
#> 4
#> ],
#> [
#> 101,
#> 201,
#> 301
#> ],
#> [
#> 1001,
#> 2001,
#> 30001
#> ]
#> ]