Add Combine An Array Of Objects Into A Single Object as a jq TIL

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
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@@ -492,6 +492,7 @@ _1332 TILs and counting..._
 
 ### jq
 
+- [Combine An Array Of Objects Into A Single Object](jq/combine-an-array-of-objects-into-a-single-object.md)
 - [Count Each Collection In A JSON Object](jq/count-each-collection-in-a-json-object.md)
 - [Count The Number Of Things In A JSON File](jq/count-the-number-of-things-in-a-json-file.md)
 - [Extract A List Of Values](jq/extract-a-list-of-values.md)

jq/combine-an-array-of-objects-into-a-single-object.md

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+# Combine An Array Of Objects Into A Single Object
+
+If you've spent any amount of time pulling data out of a JSON file with `jq`,
+you may have run into a result set that looks a little too spacious. It's this
+array of single key-value pair objects.
+
+```bash
+$ jq '.items | map({(.slug)}: .amount})' my-data.json
+
+[
+  {
+    "key-1": 123
+  },
+  {
+    "key-2": 345
+  },
+  {
+    "key-3": 456
+  },
+  ...
+]
+```
+
+When what you really wanted was a single object full of those unique key-value
+pairs.
+
+That query has you 90% of the way there. The trick is to pipe that array
+through the [`add` function](https://jqlang.github.io/jq/manual/#add) which
+will combine each of those individual objects into a single object.
+
+```bash
+$ jq '.items | map({(.slug)}: .amount}) | add' my-data.json
+
+{
+  "key-1": 123,
+  "key-2": 345,
+  "key-3": 456,
+  ...
+}
+```