Message from JavaScript discussions

September 2017

— Also look at util.promisify

—

const fs =
  require('fs');
const { promisify } =
  require('util');

const mkdir =
  promisify(fs.mkdir);
const readFile =
  promisify(fs.readFile);
const writeFile =
  promisify(fs.writeFile);

mkdir('stuff')
  .then(() =>
    readFile('read.txt'))
  .then(data =>
    writeFile('stuff/write.txt', data));

— Okay const means constant and that variable fs can't be changed or reassigned

— Yep

— Always use const unless you plan to reassign

— Okay thank u i will note that down now

— Not really, all it is, is an event loop and cooperative scheduler, things that can be used for any purpose

Message permanent page

— It basically lets seperate things get processing time without returning

— Single-threaded

— Applications will use system calls to the kernel for specific things. Stuff like yield DISPATCHER_WAIT(pid); which tells the scheduler to not run the program's main thread again, only running the event loop, until the dispatcher gets an IPC message from the specified pid

Message permanent page

— There will be messaging between running programs, so you might want to wait for a message sometimes.

— I will also be disabling Node automatic GC via C++