Files

Image viewer

You can drop any image available in the folder of your notebook and type in a new cell its filename

randompic.png

Reading and writing files

In principle you can print the content of any file located in the notebook's folder by typing its name without line breaks

filename.txt

For writing this is the same, but the actual content goes from the next line

filename.txt
Hello World

Or, if you are writing a package, it will come handy

cell 1

IR.wl

BeginPackage["JerryI`Mirage`IR`"]

(* utils *)
MapHeld[f_, list_] := Table[Extract[Unevaluated[list], i, f], {i, 1, Length[Unevaluated[list]]}]
SetAttributes[MapHeld, HoldAll]

ClearAll[Lexer]
SetAttributes[Lexer, HoldAll]

...

And then, it can be imported easily

cell 2

Get["IR.wl"];

info

Frontend detects the file extension and tries to find a proper syntax highlighting scheme.