ladybird/Libraries/LibJS/Tests/regress/function-bind-arguments.js
Andreas Kling 74f133293d
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LibJS: Avoid redundant ExecutionContext allocation for bound functions
Instead of creating a second ExecutionContext in BoundFunction.[[Call]],
we now implement BoundFunction::get_stack_frame_size() and combine
information from the target + the bound arguments list.

This allows BoundFunction.[[Call]] to reuse the already-established
ExecutionContext for the callee.

1.20x speedup on MicroBench/bound-call-04-args.js
2025-05-07 13:20:41 +02:00

17 lines
540 B
JavaScript

test("Some function.bind cases", () => {
function collectArguments() {
let a = [];
for (let i = 0; i < arguments.length; ++i) a.push(arguments[i]);
return a;
}
let b = collectArguments.bind(null);
expect(b()).toEqual([]);
expect(b(3, 4)).toEqual([3, 4]);
expect(b(3, 4, 5, 6)).toEqual([3, 4, 5, 6]);
let b12 = collectArguments.bind(null, 1, 2);
expect(b12()).toEqual([1, 2]);
expect(b12(3, 4)).toEqual([1, 2, 3, 4]);
expect(b12(3, 4, 5, 6)).toEqual([1, 2, 3, 4, 5, 6]);
});