@basic-streams/map2

``typescript
map2(
fn: (a: A, b: B) => C,
streamA: Stream,
streamB: Stream,
): Stream
`

Creates a stream containing fn(a, b) where a and b are the latest values
from streamA and streamB. The resulting stream updates when any of source
stream update.

`js
import ofMany from "@basic-streams/of-many"
import map2 from "@basic-streams/map2"

const streamA = ofMany([2, 4], 10000)
const streamB = ofMany([1, 3], 8000)
const result = map2((a, b) => a + b, streamA, streamB)

result(x => {
console.log(x)
})

// > 3
// > 5
// > 7

// streamA: _________2_________4
// streamB: _______1_______3
// result: _________3_____5___7
``