diff options
author | Nico Williams <nico@cryptonector.com> | 2014-05-12 00:30:55 -0500 |
---|---|---|
committer | Nico Williams <nico@cryptonector.com> | 2014-05-12 00:30:55 -0500 |
commit | d46f5d29fa16cbb1f3cf41e9607339d1fecfb0cc (patch) | |
tree | e5599f694d29e28ac7eb6c13262d5fea06960c1a | |
parent | 022a4188944bfd12cfd0dedef61644ac49e3fa13 (diff) | |
parent | 69aa0003af6848e6ea95b5ff85ca9ef24e747db2 (diff) |
Merge pull request #360 from slapresta/275-unique-by
unique_by(.foo) function
-rw-r--r-- | builtin.c | 1 | ||||
-rw-r--r-- | docs/content/3.manual/manual.yml | 18 |
2 files changed, 19 insertions, 0 deletions
@@ -664,6 +664,7 @@ static const char* const jq_builtins[] = { "def sort_by(f): _sort_by_impl(map([f]));", "def group_by(f): _group_by_impl(map([f]));", "def unique: group_by(.) | map(.[0]);", + "def unique_by(f): group_by(f) | map(.[0]);", "def max_by(f): _max_by_impl(map([f]));", "def min_by(f): _min_by_impl(map([f]));", #include "libm.h" diff --git a/docs/content/3.manual/manual.yml b/docs/content/3.manual/manual.yml index c8fcb5fa..aec2ca19 100644 --- a/docs/content/3.manual/manual.yml +++ b/docs/content/3.manual/manual.yml @@ -931,6 +931,24 @@ sections: input: '[1,2,5,3,5,3,1,3]' output: ['[1,2,3,5]'] + - title: `unique_by` + body: | + + The `unique_by(.foo)` function takes as input an array and produces + an array of the same elements, in sorted order, with + elqements with a duplicate `.foo` field removed. Think of it as making + an array by taking one element out of every group produced by + `group_by`. + + examples: + - program: 'unique_by(.foo)' + input: '[{"foo": 1, "bar": 2}, {"foo": 1, "bar": 3}, {"foo": 4, "bar": 5}]' + output: ['[{"foo": 1, "bar": 2}, {"foo": 4, "bar": 5}]'] + - program: 'unique_by(length)' + input: '["chunky", "bacon", "kitten", "cicada", "asparagus"]' + output: ['["chunky", "bacon", "asparagus"]'] + + - title: `reverse` body: | |