How to check beforehand that the value won't throw exception when added to WeakSet in JavaScript? What is the most performant way?

Root finding using the FloPoly JavaScript library for various degree polynomials with varying number of roots.

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Testing different methods of checking whether an element is or is in another element. Start from the position where you have jquery objects. Make === or parentNodes a function call. Check that alternatives return the correct answer. Try with a container selector rather than element (the main advantage() of closest()). Without redundant check.

Testing different methods of checking whether an element is or is in another element. Start from the position where you have jquery objects. Make === or parentNodes a function call. Check that alternatives return the correct answer. Try with a container selector rather than element (the main advantage() of closest())

Testing different methods of checking whether an element is or is in another element. Start from the position where you have jquery objects. Make === or parentNodes a function call. Check that alternatives return the correct answer.

Testing different methods of checking whether an element is or is in another element. Start from the position where you have jquery objects. Make === or parentNodes a function call

Testing different methods of checking whether an element is or is in another element. Start from the position where you have jquery objects.