Diffusion Ant (slabs) Code

ant/tests/test_primitive_wrappers.js
327d21970a03slabs

test_primitive_wrappers.js
View Options

			// Test primitive wrapper objects with SLOT_PRIMITIVE

			let passed = 0;
			let failed = 0;

			function test(name, condition) {
			if (condition) {
			console.log("✓", name);
			passed++;
			} else {
			console.log("✗", name);
			failed++;
			}
			}

			// String wrapper
			let s = new String("hello");
			test("String wrapper typeof", typeof s === "object");
			test("String wrapper + concat", s + " world" === "hello world");
			test("String wrapper length", s.length === 5);
			test("String wrapper valueOf", s.valueOf() === "hello");

			// Number wrapper
			let n = new Number(42);
			test("Number wrapper typeof", typeof n === "object");
			test("Number wrapper + arithmetic", n + 8 === 50);
			test("Number wrapper valueOf", n.valueOf() === 42);

			// Boolean wrapper
			let b = new Boolean(true);
			test("Boolean wrapper typeof", typeof b === "object");
			test("Boolean wrapper is truthy", !!b === true);
			test("Boolean wrapper valueOf", b.valueOf() === true);

			// Slot should be hidden from enumeration
			let sKeys = Object.keys(s);
			test("String keys excludes internal slot", !sKeys.includes("__primitive_value__"));

			let nKeys = Object.keys(n);
			test("Number keys excludes internal slot", !nKeys.includes("__primitive_value__"));

			// Object() wrapping primitives
			let wrapped = Object("test");
			test("Object(string) is object", typeof wrapped === "object");
			test("Object(string) valueOf", wrapped.valueOf() === "test");

			console.log("\nResults:", passed, "passed,", failed, "failed");

Owner Packages

No Owners