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const obj = {
    a: 32,
    b: 32,
    c: "Hello",
    d: 128,
};

let total = 0;
Object.prototype.parentPro = 300;
function iterateToSum(obj) {

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import socket

serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

host = socket.gethostbyname('')
port = 5001
serversocket.bind((host, port))
serversocket.listen()

while True:

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Element(like div)

clientHeight = padding + height(沒scrollbar)

offsetHeight = padding + border + height

scrollHeight >= clientHeight

Body

clientHeight = padding + height

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前言

• Iteration methods：會每一個element都給他see一次，every()、filter()、forEach()、map()、some()

• Accessor methods：不會更動陣列本身，只是呈現你想呈現的，lastIndexOf()、indexOf()

• Mutator methods：push() pop() unshift() shift()

Methods

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var alpha = 'dajvgiasdrrrrkq;wrklrq';

var Letters = new Map();

// has set get methods
alpha.split('').map(letter => {
  if (!Letters.has(letter)) Letters.set(letter, 1);
  else Letters.set(letter, Letters.get(letter) + 1);
});
// keys() values() and entries() contain both.

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var arr = ['a', 'b', 'c', 'd', 'e'];
var eArr = arr.entries();

console.log(eArr.next()); // { value: [ 0, 'a' ], done: false }
console.log(eArr.next().value); // [1, 'b']

// 剩下c,d,e還沒跑出來，所以...
for (let e of eArr) {
  console.log(e);
}

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※ NaN === NaN  -->  false
※ isNaN(NaN)   -->  true
※ typeof NaN   --> 'number'
※ isNaN(x)、isNaN(x - 0)、isNaN(Number(x))、Number.isNaN(x - 0)、Number.isNaN(Number(x))都是一樣的東西

一、false狀況下：

      1.  的確是數字
      

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/*-----------------------------------------------------------------------------
the reference is from UdemyCourse: LearningDataStructuresinJavascriptFromScratch
-----------------------------------------------------------------------------*/

function HashTable(size) {
  this.buckets = Array(size);
  this.numBuckets = this.buckets.length;
}

function HashNode(key, value, next) {

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/*-----------------------------------------------------------------------------
the reference is from UdemyCourse: LearningDataStructuresinJavascriptFromScratch
-----------------------------------------------------------------------------*/
function BST(value) {
  this.value = value;
  this.left = null;
  this.right = null;
}

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/*-----------------------------------------------------------------------------
the reference is from UdemyCourse: LearningDataStructuresinJavascriptFromScratch
-----------------------------------------------------------------------------*/

function LinkedList() {
  this.head = null;
  this.tail = null;
}

function Node(value, next, prev) {