Atom editor on the fly evaluation code


I seen Scala editor that capable to evaluate each lines of code on the fly without having to run whole program to debug:

var a=“Hello”, b="World"
a+b => Hello World

var a={…}
a |> Object {0: …, 1: …}

Is there any package available or this idea will be extreme useful for productivity and easier to debug on the spot.


Search packages at for the language you want. You might get lucky.


There is the hydrogen package for one.


Sorry, my projects is entire in Javascript, I don’t think hydrogen is made for Javascript?


There’s the JavaScript console in the Developer Tools.