src/utils.mjs: Add dissoc()

2 files changed, 24 insertions, 0 deletions

diff --git a/src/utils.mjs b/src/utils.mjs
index 1080219..9a600e7 100644
--- a/src/utils.mjs
+++ b/src/utils.mjs
@@ -25,6 +25,12 @@ export const assocIn = (obj, path, value) =>
 				)
 			};
 
+export const dissoc = (obj, key) => {
+	const ret = { ...obj };
+	delete ret[key]
+	return ret;
+};
+
 export const getIn = (obj, path) =>
 	path.length === 0 ? obj :
 		getIn(obj?.[path[0]], path.slice(1));
diff --git a/tests/js/utils.mjs b/tests/js/utils.mjs
index d8a8ded..33bdac2 100644
--- a/tests/js/utils.mjs
+++ b/tests/js/utils.mjs
@@ -5,6 +5,7 @@ import {
 	keys,
 	difference,
 	assocIn,
+	dissoc,
 	getIn,
 	findFirst,
 	partial,
@@ -123,6 +124,22 @@ const test_assocIn = async t => {
 	});
 };
 
+const test_dissoc = async t => {
+	t.start("dissoc()");
+
+	await t.test("empty values", () => {
+		assert.deepEqual(dissoc({}, "k"), {});
+	});
+
+	await t.test("noop when key does not exist", () => {
+		assert.deepEqual(dissoc({ a: 1 }, "b"), { a: 1 });
+	});
+
+	await t.test("removes the key", () => {
+		assert.deepEqual(dissoc({ a: 1, b: 2}, "b"), { a: 1 });
+	});
+};
+
 const test_getIn = async t => {
 	t.start("getIn()");
 
@@ -347,6 +364,7 @@ await runner.runTests([
 	test_keys,
 	test_difference,
 	test_assocIn,
+	test_dissoc,
 	test_getIn,
 	test_findFirst,
 	test_partial,