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LibJS: Treat missing arg in Array.prototype.includes() as undefined

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Linus Groh 2020-05-21 20:50:53 +01:00 • committed by Andreas Kling
parent fbcfc8dcd0
commit 5db9becc4a
2 changed files with 4 additions and 2 deletions
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4
Libraries/LibJS/Runtime/ArrayPrototype.cpp
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@ -422,8 +422,8 @@ Value ArrayPrototype::includes(Interpreter& interpreter)
if (!array)
return {};
i32 array_size = static_cast<i32>(array->elements().size());
if (interpreter.argument_count() == 0 || array_size == 0)
i32 array_size = array->elements().size();
if (array_size == 0)
return Value(false);
i32 from_index = 0;

2
Libraries/LibJS/Tests/Array.prototype.includes.js
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@ -5,6 +5,8 @@ try {
var array = ['hello', 'friends', 1, 2, false];
assert([].includes() === false);
assert([undefined].includes() === true);
assert(array.includes('hello') === true);
assert(array.includes(1) === true);
assert(array.includes(1, -3) === true);