LibJS: Add %TypedArray%.prototype.some

3 files changed, 86 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
index 5b9eaf1df8..1c109c7aab 100644
--- a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2021, Luke Wilde <lukew@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -30,6 +31,7 @@ void TypedArrayPrototype::initialize(GlobalObject& object)
     define_native_function(vm.names.find, find, 1, attr);
     define_native_function(vm.names.findIndex, find_index, 1, attr);
     define_native_function(vm.names.forEach, for_each, 1, attr);
+    define_native_function(vm.names.some, some, 1, attr);
 }
 
 TypedArrayPrototype::~TypedArrayPrototype()
@@ -179,6 +181,20 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::for_each)
     return js_undefined();
 }
 
+// 23.2.3.25 %TypedArray%.prototype.some ( callbackfn [ , thisArg ] ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.some
+JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::some)
+{
+    auto result = false;
+    for_each_item(vm, global_object, "some", [&](auto, auto, auto callback_result) {
+        if (callback_result.to_boolean()) {
+            result = true;
+            return IterationDecision::Break;
+        }
+        return IterationDecision::Continue;
+    });
+    return Value(result);
+}
+
 // 23.2.3.1 get %TypedArray%.prototype.buffer, https://tc39.es/ecma262/#sec-get-%typedarray%.prototype.buffer
 JS_DEFINE_NATIVE_GETTER(TypedArrayPrototype::buffer_getter)
 {
diff --git a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.h b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.h
index 0830745140..bb939c9997 100644
--- a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2021, Luke Wilde <lukew@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -29,6 +30,7 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(find);
     JS_DECLARE_NATIVE_FUNCTION(find_index);
     JS_DECLARE_NATIVE_FUNCTION(for_each);
+    JS_DECLARE_NATIVE_FUNCTION(some);
 };
 
 }
diff --git a/Userland/Libraries/LibJS/Tests/builtins/TypedArray/TypedArray.prototype.some.js b/Userland/Libraries/LibJS/Tests/builtins/TypedArray/TypedArray.prototype.some.js
new file mode 100644
index 0000000000..a09588dc38
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/TypedArray/TypedArray.prototype.some.js
@@ -0,0 +1,68 @@
+const TYPED_ARRAYS = [
+    Uint8Array,
+    Uint16Array,
+    Uint32Array,
+    Int8Array,
+    Int16Array,
+    Int32Array,
+    Float32Array,
+    Float64Array,
+];
+
+const BIGINT_TYPED_ARRAYS = [BigUint64Array, BigInt64Array];
+
+test("length is 1", () => {
+    TYPED_ARRAYS.forEach(T => {
+        expect(T.prototype.some).toHaveLength(1);
+    });
+
+    BIGINT_TYPED_ARRAYS.forEach(T => {
+        expect(T.prototype.some).toHaveLength(1);
+    });
+});
+
+describe("errors", () => {
+    function errorTests(T) {
+        test(`requires at least one argument (${T.name})`, () => {
+            expect(() => {
+                new T().some();
+            }).toThrowWithMessage(
+                TypeError,
+                "TypedArray.prototype.some() requires at least one argument"
+            );
+        });
+
+        test(`callback must be a function (${T.name})`, () => {
+            expect(() => {
+                new T().some(undefined);
+            }).toThrowWithMessage(TypeError, "undefined is not a function");
+        });
+    }
+
+    TYPED_ARRAYS.forEach(T => errorTests(T));
+    BIGINT_TYPED_ARRAYS.forEach(T => errorTests(T));
+});
+
+test("basic functionality", () => {
+    TYPED_ARRAYS.forEach(T => {
+        const typedArray = new T([2, 4, 6]);
+        expect(typedArray.some(value => value === 2)).toBeTrue();
+        expect(typedArray.some(value => value === 4)).toBeTrue();
+        expect(typedArray.some(value => value === 6)).toBeTrue();
+        expect(typedArray.some(value => value % 2 === 0)).toBeTrue();
+        expect(typedArray.some(value => value % 2 === 1)).toBeFalse();
+        expect(typedArray.some(value => value < 2)).toBeFalse();
+        expect(typedArray.some(value => value > 2)).toBeTrue();
+    });
+
+    BIGINT_TYPED_ARRAYS.forEach(T => {
+        const typedArray = new T([2n, 4n, 6n]);
+        expect(typedArray.some(value => value === 2n)).toBeTrue();
+        expect(typedArray.some(value => value === 4n)).toBeTrue();
+        expect(typedArray.some(value => value === 6n)).toBeTrue();
+        expect(typedArray.some(value => value % 2n === 0n)).toBeTrue();
+        expect(typedArray.some(value => value % 2n === 1n)).toBeFalse();
+        expect(typedArray.some(value => value < 2n)).toBeFalse();
+        expect(typedArray.some(value => value > 2n)).toBeTrue();
+    });
+});