Différences

Ci-dessous, les différences entre deux révisions de la page.

--- informatique:jq [03/10/2021 12:48] – [Play with js] cyrille
+++ informatique:jq [04/10/2021 08:40] (Version actuelle) – [jq] cyrille
@@ Ligne 1: / Ligne 1: @@
 ====== jq ======
-[[https://github.com/stedolan/jq/|jq]]
+**[[https://stedolan.github.io/jq/|jq]]** a lightweight and flexible command-line JSON processor.
+  * Le [[https://stedolan.github.io/jq/manual/|Manuel]]
   * La [[https://github.com/stedolan/jq/wiki/FAQ|FAQ]]
   * Le [[https://github.com/stedolan/jq/wiki/Cookbook|Cookbook]]
@@ Ligne 14: / Ligne 15: @@
-===== Play with js =====
+===== Play with jq =====
 ''members.json'':
@@ Ligne 51: / Ligne 52: @@
 </code>
-==== Howto count occurrence of "grouped by key" with jq? ====
+==== Howto count occurrence of "grouped by key=value" with jq? ====
-No need to use ''group_by'' -> https://stackoverflow.com/questions/69423726/howto-count-occurrence-of-grouped-by-key-with-jq/69423860#69423860
+https://stackoverflow.com/questions/69423726/howto-count-occurrence-of-grouped-by-key-with-jq/
-<code bsh>
+=== Sans group_by ===
+<code bash>
 jq '"foo" as $title | .[] | {
   id: .member_id,
@@ Ligne 75: / Ligne 78: @@
 </code>
+=== Avec group_by ===
+<code bash>
+jq  'map(
+         (.member_id) as $m
+        | .loans[].media[]
+        | select(.title=="foo")
+        | {id: $m, title: .title}
+        )
+    |group_by(.id)[]
+    |.[0] + { count: length }
+' members.json
+</code>