LibJS: Add Array.isArray()

1 files changed, 28 insertions, 0 deletions

diff --git a/Libraries/LibJS/Tests/Array.isArray.js b/Libraries/LibJS/Tests/Array.isArray.js
new file mode 100644
index 0000000000..714f6e08ea
--- /dev/null
+++ b/Libraries/LibJS/Tests/Array.isArray.js
@@ -0,0 +1,28 @@
+load("test-common.js");
+
+try {
+    assert(Array.isArray.length === 1);
+
+    assert(Array.isArray() === false);
+    assert(Array.isArray("1") === false);
+    assert(Array.isArray("foo") === false);
+    assert(Array.isArray(1) === false);
+    assert(Array.isArray(1, 2, 3) === false);
+    assert(Array.isArray(undefined) === false);
+    assert(Array.isArray(null) === false);
+    assert(Array.isArray(Infinity) === false);
+    assert(Array.isArray({}) === false);
+
+    assert(Array.isArray([]) === true);
+    assert(Array.isArray([1]) === true);
+    assert(Array.isArray([1, 2, 3]) === true);
+    assert(Array.isArray(new Array()) === true);
+    assert(Array.isArray(new Array(10)) === true);
+    assert(Array.isArray(new Array("a", "b", "c")) === true);
+    // FIXME: Array.prototype is supposed to be an array!
+    // assert(Array.isArray(Array.prototype) === true);
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}