pull stream every pair of values through a function.
var pull = require('pull-stream')
var pairs = require('pull-pairs')
pull(
pull.values([1,2,3,4,5]),
pairs(function mapper (a, b) {
console.log([a, b])
//return the normal output.
return b
}),
pull.drain()
)
console.log output will be:
null 1
1 2
2 3
3 4
4 5
the return value of mapper will be the output of the stream.
if the return value is undefined then
MIT