lin

Based on https://stackoverflow.com/questions/1260748/how-do-i-remove-a-submodule and https://stackoverflow.com/questions/47008290/git-how-to-make-outer-repository-and-embedded-repository-work-as-common-standal

Note: path/to/submodule (no trailing slash)

• git clone https://github.com/lin/somerepo
• git add .
• git commit -m 'add somerepo'

1. git submodule deinit -f -- path/to/submodule
2. rm -rf .git/modules/path/to/submodule

lin

render () {
  // how much progress is it?
  // from 0 to 1
  let progress = time / duration
  
  // apply ease function to the progress
  // lots of action is actually based on ease function
  // the ease function works like affine transformation matrix
  // it can make all kinds of simple transformation to the tween
  let ratio = ease(progress)

lin

// https://stackoverflow.com/questions/34371980/multiple-left-hand-assignment-with-javascript-really-right-associative

// assignment == situation 3
let arr = [0, 1]
let pointer = arr
pointer[2] = pointer = pointer[2] || []
console.log(pointer, arr);

// situation 1
let arr = [0, 1]

lin

The first 128 chars are ASCII or Control Chars and Basic Latin, which is the most important part of the Unicode.

Among the first 128, the first 32 are control chars, notably:

10, 0x000A is New Line (NL) \n

13, 0x000D is Carriage Return (CR) \r

Among the first 128, the next 96 are basic latin, notably:

lin

// why we introduce class.
// this is a simple way to encapulate repeated patterns
// which is larger than the functions
// but as we can see that a class is a function underneath
// class = object + a construction function

let Object = require('./Object')

function createUser ( name, age ) { // the name and age is what special about this object
    // what actuallly is important is that

lin

var Mixin = {}

Mixin.mix_into_prototype = function() {
    for (var i = 0; i < arguments.length; i++) {
      let current_object = arguments[i]
      for (let key in current_object) {
        this[key] = current_object[key]
      }
    }
    return this;

lin

let user = { name: "John" };
let speak = function (price) {
   console.log(this.name + ' offers ' + price)
}

function dot_object_call(obj, fun, args){
  fun.call(obj, args)
  // or:
  // fun.bind(obj)(args)
}

lin

Elements of Abstraction

1. Definition of Abstration

if (A.checker(a) == true)
  console.log(a.in(A)) // true
// A.checker(a) == true => a \in A

lin

1. Grammar that is SLR(1), but not LR(0)

S -> a A c | a B d.
A -> z.
B -> z.

The test string can be azc.

Click for more about the above grammar, LR(0) Item Sets

lin

1, when you define a function, it binds this to the object it might belongs to.

const obj = {
  method: function() {
    // this is obj
  }
};

//otherwise:
function(){