ijavascript tips and install.txt

$ means from commandline


install dependencies:

(assuming homebrew, npm already installed:)
$brew install pkg-config node zeromq
(pip automatically comes with Python2 automatically comes with macOS, but not as good as web install)
(web install latest version of pip, requires and automatically comes with Python, say version 3.7:)
Install Python3.7 from python.org/downloads
Accepting defaults installs it to ~/../../Library/Frameworks/Python.framework/Versions/3.7 
$python3.7
$exit()
$pip3.7
$sudo pip3.7 install --upgrade pyzmq jupyter
$pip3.7 show jupyter
Installed to ~/../../Library/Frameworks/Python.framework/Versions/3.7/bin/


install ijavascript:

(install locally, since other way not working)
$ npm config set prefix ~
$ npm install -g ijavascript
$ export PATH=$PATH:$HOME/bin
$ export PATH=$PATH:/Library/Frameworks/Python.framework/Versions/3.7/bin
$ npm install -g ijavascript
$ ijs --versions
$ ijsinstall
$ which ijs
Installed to $HOME/bin/


(restart commandline)


run ijavascript:

$ export PATH=$PATH:$HOME/bin
$pip3.7 show jupyter
(copy/paste path, preceded by export PATH=$PATH:, with lib... changed to bin:)
$ export PATH=$PATH:/Library/Frameworks/Python.framework/Versions/3.7/bin
$ ijsnotebook
choose working directory
New > Javascript (Node.js)


start coding!

No undo, instead:
Save and Checkpoint
Revert to Checkpoint
but can only have 1 checkpoint at a time :/
No CTRL-C, instead:
Kernel>Interrupt
Run code by SHIFT-ENTER or Cell > Run:
only outputs last output, for rest use console.log(...)
even markdown cells must be evaluated
to edit markdown cells, double-click on them
[*] means busy
For ijavascript, choose Kernel > Restart & Clear Output between code reruns


exit ijavascript:

$ [CTRL-C]
exit? y [Enter]
close browser


Uninstall pip (for, say, pip3.7):
$ pip3.7 uninstall pip
$ pip3.7

Reinstall pip (for, say, pip3.7):
$ python3.7 -m ensurepip --default-pip

Uninstall jupyter notebook:
$pip3.7 uninstall jupyter notebook

Install python modules:
(anything you install in python will be usable in jupyter notebook)
(if already installed, will tell you)
$pip3.7 install numpy scipy matplotlib openpyxl

Update versions: 
install new python version by repeating above steps
uninstall old python version if you wish
$pip3.7 install -U pip
$pip3.7 install -U notebook
$pip3.7 install pipdate
$pipdate3
(updates all python modules, including jupyter)