pavelusov/usov-nodejs-otus

Course of Nodejs from Otus.ru

Course of NodeJS from Otus.ru

Instructions for modes

Development mode:

npm run dev

View mode:

npm run build
npm start

View mode with arguments:

npm run build
npm start -- arg1 arg2 arg3

1. Creating an NPM package to display the tree

1.1 Write a function for displaying a tree structure

{
 "name": 1,
 "items": [
  {
    "name": 2,
    "items": [{ "name": 3 }, { "name": 4 }]
  }, 
  {
    "name": 5,
    "items": [{ "name": 6 }]
  }]
}

1.2 An example of running

npm start
1
├── 2
│ └── 3
│ └── 4
└── 5
  └── 6

2. CLI utility for working with a file system

2.1 To write a "tree" utility for comfortable display a directory structure.

The utility must accept a mandatory input argument - the path to the directory to display its structure. Also it must to understand an option of a display depth(--depth or -d). The option value is number.

tree Node.js -d 2
Node.js
├── cluster
│ └── index.js
├── domain
│ ├── error.js
│ ├── flow.js
│ └── run.js
├── errors
│ ├── counter.js
│ └── try-catch.js
└── worker
 └── index.js

2.2 Run

Run with a depth

npm run build
npm start -- ../ -d 2

or

Run without a depth

npm run build
npm start -- ../

or

Run with some path

npm run build
npm start -- /Users/User/Documents

3. Streams of file system

3.1 Run dev

Source file size 100 MB Constraint 50 MB(generation very long time)

For development the Source file size set up 1 MB Constraint is 500 KB

0.5 === 500 KB

npm run dev -- --max-old-space-size=0.5