feat: object/ensure

README.md

@@ -20,6 +20,19 @@ isObject(true); // false
 isObject(null); // false
 ```
 
+##### `object/ensure`
+
+If given argument is an object, it is returned back. Otherwise `TypeError` is thrown.
+
+```javascript
+const ensureObject = require("type/object/ensure");
+
+const obj = {};
+
+ensureObject(obj); // obj
+ensureString(null); // Thrown TypeError: null is not an object
+```
+
 #### String
 
 _string_ primitives

object/ensure.js

@@ -0,0 +1,9 @@
+"use strict";
+
+var resolveException = require("../lib/resolve-exception")
+  , is               = require("./is");
+
+module.exports = function (value/*, options*/) {
+	if (is(value)) return value;
+	return resolveException(value, "%v is not an object", arguments[1]);
+};

test/object/ensure.js

@@ -0,0 +1,20 @@
+"use strict";
+
+var assert       = require("chai").assert
+  , ensureObject = require("../../object/ensure");
+
+describe("string/ensure", function () {
+	it("Should return input value", function () {
+		var value = {};
+		assert.equal(ensureObject(value), value);
+	});
+	it("Should crash on no value", function () {
+		try {
+			ensureObject(null);
+			throw new Error("Unexpected");
+		} catch (error) {
+			assert.equal(error.name, "TypeError");
+			assert.equal(error.message, "null is not an object");
+		}
+	});
+});