[New] add boundFunctionsHaveNames()

inspect-js · Oct 21, 2019 · 05661be · 05661be
1 parent 1dd3b01
commit 05661be
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diff --git a/index.js b/index.js
@@ -10,4 +10,10 @@ functionsHaveNames.functionsHaveConfigurableNames = function functionsHaveConfig
 	return functionsHaveNames() && gOPD && !!gOPD(function () {}, 'name').configurable;
 };
 
+var $bind = Function.prototype.bind;
+
+functionsHaveNames.boundFunctionsHaveNames = function boundFunctionsHaveNames() {
+	return functionsHaveNames() && typeof $bind === 'function' && (function f() {}).bind().name !== '';
+};
+
 module.exports = functionsHaveNames;
diff --git a/test/index.js b/test/index.js
@@ -39,3 +39,18 @@ test('functionsHaveConfigurableNames', function (t) {
 
 	t.end();
 });
+
+test('boundFunctionsHaveNames', function (t) {
+	t.equal(typeof hasNames.boundFunctionsHaveNames, 'function', 'is a function');
+
+	var fn = function f() {};
+	if (typeof fn.bind !== 'function') {
+		t.equal(hasNames.boundFunctionsHaveNames(), false, 'bound functions do not have names, because .bind does not exist');
+	} else if (hasNames()) {
+		t.equal(hasNames.boundFunctionsHaveNames(), fn.bind().name !== '', 'bound functions have names');
+	} else {
+		t.equal(hasNames.boundFunctionsHaveNames(), false, 'bound functions do not have names, because none do');
+	}
+
+	t.end();
+});