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LibJS: Add spec comments to TypedArray.prototype.includes
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sideshowbarker
2024-07-17 04:21:37 +09:00
Author: https://github.com/jamierocks Commit: https://github.com/SerenityOS/serenity/commit/34f27f76ec Pull-request: https://github.com/SerenityOS/serenity/pull/16117 Reviewed-by: https://github.com/linusg ✅
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@ -604,39 +604,61 @@ JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::for_each)
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// 23.2.3.16 %TypedArray%.prototype.includes ( searchElement [ , fromIndex ] ), https://tc39.es/ecma262/#sec-%typedarray%.prototype.includes
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JS_DEFINE_NATIVE_FUNCTION(TypedArrayPrototype::includes)
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{
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// 1. Let O be the this value.
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// 2. Perform ? ValidateTypedArray(O).
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auto typed_array = TRY(validate_typed_array_from_this(vm));
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// 3. Let len be O.[[ArrayLength]].
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auto length = typed_array->array_length();
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// 4. If len is 0, return false.
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if (length == 0)
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return Value(false);
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// 5. Let n be ? ToIntegerOrInfinity(fromIndex).
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auto n = TRY(vm.argument(1).to_integer_or_infinity(vm));
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// FIXME: 6. Assert: If fromIndex is undefined, then n is 0.
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auto value_n = Value(n);
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// 7. If n is +∞, return false.
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if (value_n.is_positive_infinity())
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return Value(false);
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// 8. Else if n is -∞, set n to 0.
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else if (value_n.is_negative_infinity())
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n = 0;
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u32 k;
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// 9. If n ≥ 0, then
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if (n >= 0) {
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// a. Let k be n.
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k = n;
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} else {
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}
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// 10. Else,
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else {
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// a. Let k be len + n.
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auto relative_k = length + n;
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// b. If k < 0, set k to 0.
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if (relative_k < 0)
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relative_k = 0;
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k = relative_k;
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}
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auto search_element = vm.argument(0);
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// 11. Repeat, while k < len,
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for (; k < length; ++k) {
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// a. Let elementK be ! Get(O, ! ToString(𝔽(k))).
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auto element_k = MUST(typed_array->get(k));
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// b. If SameValueZero(searchElement, elementK) is true, return true.
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if (same_value_zero(search_element, element_k))
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return Value(true);
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// c. Set k to k + 1.
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}
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// 12. Return false.
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return Value(false);
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}
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