(Highland) stream vs array transformation

stream_vs_array.js

(function() {
    var highland = require("highland")
    
    var array = [1,2,3],
        spy = (message, fn) => {
            return x => {
                console.log(`${message} ${x}`)
                return fn(x)
            }
        },
        increment = spy("incrementing", x => x + 1),
        double = spy("doubling", x => x * 2),
        evenOnly = spy("filter", x => x % 2 === 0),
        output = spy("done", x => x)

    highland(array)
        .map(increment)
        .filter(evenOnly)
        .map(double)
        .each(output)

    console.log("---")
    
    array
        .map(increment)
        .filter(evenOnly)
        .map(double)
        .forEach(output)
})()

/*
incrementing 1
filter 2
doubling 2
done 4
incrementing 2
filter 3
incrementing 3
filter 4
doubling 4
done 8
---
incrementing 1
incrementing 2
incrementing 3
filter 2
filter 3
filter 4
doubling 2
doubling 4
done 4
done 8
*/