Can null == null?

If you think of it from a programming (i.e. pointer reference) point of view then, yes, two references of null have the same pointer value and, since most of the popular languages will fall back to pointer-equality if no custom equality is defined, null does equal null .

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What is object type array?

The Array Object. Arrays are data structures that store information in a set of adjacent memory addresses . In practice, this means is that you can store other variables and objects inside an array and can retrieve them from the array by referring to their position number in the array.

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