LibJS: Add Array.of()

3 files changed, 47 insertions, 0 deletions

diff --git a/Libraries/LibJS/Runtime/ArrayConstructor.cpp b/Libraries/LibJS/Runtime/ArrayConstructor.cpp
index 003171de39..3c5b7c07b6 100644
--- a/Libraries/LibJS/Runtime/ArrayConstructor.cpp
+++ b/Libraries/LibJS/Runtime/ArrayConstructor.cpp
@@ -44,6 +44,7 @@ ArrayConstructor::ArrayConstructor()
 
     u8 attr = Attribute::Writable | Attribute::Configurable;
     put_native_function("isArray", is_array, 1, attr);
+    put_native_function("of", of, 0, attr);
 }
 
 ArrayConstructor::~ArrayConstructor()
@@ -86,4 +87,12 @@ Value ArrayConstructor::is_array(Interpreter& interpreter)
     return Value(StringView(value.as_object().class_name()) == "Array");
 }
 
+Value ArrayConstructor::of(Interpreter& interpreter)
+{
+    auto* array = Array::create(interpreter.global_object());
+    for (size_t i = 0; i < interpreter.argument_count(); ++i)
+        array->elements().append(interpreter.argument(i));
+    return array;
+}
+
 }
diff --git a/Libraries/LibJS/Runtime/ArrayConstructor.h b/Libraries/LibJS/Runtime/ArrayConstructor.h
index a038d080e4..14e5f30665 100644
--- a/Libraries/LibJS/Runtime/ArrayConstructor.h
+++ b/Libraries/LibJS/Runtime/ArrayConstructor.h
@@ -43,6 +43,7 @@ private:
     virtual const char* class_name() const override { return "ArrayConstructor"; }
 
     static Value is_array(Interpreter&);
+    static Value of(Interpreter&);
 };
 
 }
diff --git a/Libraries/LibJS/Tests/Array.of.js b/Libraries/LibJS/Tests/Array.of.js
new file mode 100644
index 0000000000..1fb4200847
--- /dev/null
+++ b/Libraries/LibJS/Tests/Array.of.js
@@ -0,0 +1,37 @@
+load("test-common.js");
+
+try {
+    assert(Array.of.length === 0);
+
+    assert(typeof Array.of() === "object");
+
+    var a;
+
+    a = Array.of(5);
+    assert(a.length === 1);
+    assert(a[0] === 5);
+
+    a = Array.of("5");
+    assert(a.length === 1);
+    assert(a[0] === "5");
+
+    a = Array.of(Infinity);
+    assert(a.length === 1);
+    assert(a[0] === Infinity);
+
+    a = Array.of(1, 2, 3);
+    assert(a.length === 3);
+    assert(a[0] === 1);
+    assert(a[1] === 2);
+    assert(a[2] === 3);
+
+    a = Array.of([1, 2, 3]);
+    assert(a.length === 1);
+    assert(a[0][0] === 1);
+    assert(a[0][1] === 2);
+    assert(a[0][2] === 3);
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}