Why do tuples start from Item1

[zms9110750]

When we were learning arrays, we learned that computer counting starts from 0. We subconsciously assume that all parameters start from 0.
so , way tuples from Item1?

[HaloFour]

That would be a runtime question as the ValueTuple<...> family of types is provided by the BCL and expected to be used across any language of the .NET ecosystem. Not all languages have a history of arrays or elements starting at 0, and tuples aren't related to arrays anyway.

[jnm2]

One way of thinking that I would offer is that the 0 in array[0] is an offset (a distance, a difference in position), whereas the 1 in Item1 is an ordinal ("which item? the first item").

[koszeggy]

We subconsciously assume that all parameters start from 0.

Those are not parameters or indexed members but fields with explicit names.

When we were learning arrays, we learned that computer counting starts from 0.

When you access the fields by the ITuple[int] indexer the indexing starts from 0 and it's also documented:

The index of the specified Tuple element. index can range from 0 for Item1 of the Tuple to one less than the number of elements in the Tuple.