Is it possible to see the declaration of an internal js function? eg: setInteval()

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I was studying a little bit about functions and I wonder if it is possible to search the declaration of an internal function in javascript as well as I can do in internal objects.

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    If I understood, yes, but not as you think. If you want to see the code snippet that defines a function (for example, the setInteval), that is, what is executed when such a function is called, needs to look for the source code of the implementation of a Javascript engine, the Chromer is the V8

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