proposal: math/rand/v2: Add IntInRange function

[knbr13]

Proposal

This proposal suggests adding a new function, IntInRange(low, high int) int, to the math/rand package.
The function generates random integers within a specified range [low, high).

Function Implementation

func IntInRange(low, high int) int {
    return rand.Intn(high-low) + low
}

Rationale

• It simplifies random integer generation within a specific range, making it easier especially for beginners.
• Provides a clean and concise code for this common task.

[mateusz834]

Probably at this point this should be a proposal for math/rand/v2 (#61716).

[leb-kuchen]

Generics make more sense for me, with and N and RangeN.

func RangeN[I integer](low, high I) I {
	return I(Uint64n(uint64(high-low)) + uint64(low))
}

[fleebus1234]

What about also getting an IRangeN (or similarly named) function

func IRangeN[I integer](low, high I) I {
	return rand.N(high-low+1) + low
}

that generates in the range [low, high]?