From 0ccdb0503953fed1b67d8724073becd4a1bd12aa Mon Sep 17 00:00:00 2001
From: Cyril Tovena <cyril.tovena@gmail.com>
Date: Thu, 26 Sep 2019 23:26:36 -0400
Subject: [PATCH] implement simple del function on object

---
 compliance/functions.json | 15 +++++++++++++++
 functions.go              | 18 ++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/compliance/functions.json b/compliance/functions.json
index 8b8db36..c4334d5 100644
--- a/compliance/functions.json
+++ b/compliance/functions.json
@@ -821,5 +821,20 @@
       "result": [[1, 2, 3, 4], [5, 6, 7, 8, 9]]
     }
   ]
+},
+{
+  "given": {
+    "array": {},
+    "deleteme": "ok",
+    "foo": [1,2,3,4]
+  },
+  "cases": [
+    {
+      "expression": "del(@,'deleteme','foo')",
+      "result": {
+        "array": {}
+      }
+    }
+  ]
 }
 ]
diff --git a/functions.go b/functions.go
index 9b7cd89..943ebbe 100644
--- a/functions.go
+++ b/functions.go
@@ -319,6 +319,14 @@ func newFunctionCaller() *functionCaller {
 			},
 			handler: jpfNotNull,
 		},
+		"del": {
+			name: "del",
+			arguments: []argSpec{
+				{types: []jpType{jpObject}},
+				{types: []jpType{jpString}, variadic: true},
+			},
+			handler: jpfDel,
+		},
 	}
 	return caller
 }
@@ -482,6 +490,16 @@ func jpfMap(arguments []interface{}) (interface{}, error) {
 	}
 	return mapped, nil
 }
+
+func jpfDel(arguments []interface{}) (interface{}, error) {
+	obj := arguments[0].(map[string]interface{})
+	for i := 1; i < len(arguments); i++ {
+		key := arguments[i].(string)
+		delete(obj, key)
+	}
+	return obj, nil
+}
+
 func jpfMax(arguments []interface{}) (interface{}, error) {
 	if items, ok := toArrayNum(arguments[0]); ok {
 		if len(items) == 0 {