Added reduce examples and doc

pkg/yqlib/operator_reduce_test.go

@@ -6,17 +6,26 @@ import (
 
 var reduceOperatorScenarios = []expressionScenario{
 	{
-		document:   `[10,2, 5, 3]`,
-		expression: `.[] as $item ireduce (0; . + $item)`,
+		description: "Sum numbers",
+		document:    `[10,2, 5, 3]`,
+		expression:  `.[] as $item ireduce (0; . + $item)`,
 		expected: []string{
 			"D0, P[], (!!int)::20\n",
 		},
 	},
+	{
+		description: "Convert an array to an object",
+		document:    `[{name: Cathy, has: apples},{name: Bob, has: bananas}]`,
+		expression:  `.[] as $item ireduce ({}; .[$item | .name] = ($item | .has) )`,
+		expected: []string{
+			"D0, P[], (!!map)::Cathy: apples\nBob: bananas\n",
+		},
+	},
 }
 
 func TestReduceOperatorScenarios(t *testing.T) {
 	for _, tt := range reduceOperatorScenarios {
 		testScenario(t, &tt)
 	}
-	// documentScenarios(t, "Reduce", reduceOperatorScenarios)
+	documentScenarios(t, "Reduce", reduceOperatorScenarios)
 }