Why is Math.pow(0, 0) === 1?

Question

We all know that 0⁰ is indeterminate.

But, javascript says that:

Math.pow(0, 0) === 1 // true

Answer 1

The C language definition says (7.12.7.4/2):

A domain error may occur if x is zero and y is zero.

It also says (7.12.1/2):

On a domain error, the function returns an implementation-defined value; if the integer expression math_errhandling & MATH_ERRNO is nonzero, the integer expression errno acquires the value EDOM; if the integer expression math_errhandling & MATH_ERREXCEPT is nonzero, the ‘‘invalid’’ floating-point exception is raised.

By default, the value of math_errhandling is MATH_ERRNO, so check errno for the value EDOM.