Dynamic Struct

這是一個非必要的函式庫，你可以調整你的習慣來達成它 這個函式庫用來幫助需要頻繁增刪欄位的物件 避免其進入 V8 字典模式降低效能

This is a non-essential library, you can adjust your habits to reach it. This library is used to help objects that need to be frequently added or deleted. Avoid entering V8 dictionary mode to reduce performance.

使用須知 Usage Notice

• 必須初始化物件所有欄位

• 值為 undefined 的欄位視為不存在

• 繼承 DStruct 為非必需的

• must initialize all fields of the object

• A field with a value of undefined is considered to be absent

• Inherit DStruct is not required

API

這是一個非常單純的函式庫，所以我不寫 API 文件 This is a very simple library, so I don't write API files.

效能測試 Benchmark

{}	Origin Object
DS	Dynamic Struct
DS=	Dynamic Struct use =undefined to delete a key

  benchmark prop8
{}: i=10000000 time=31 ops=322580645
DS: i=10000000 time=224 ops=44642857
    ✓ new (259ms)
{}: i=10000000 time=60 ops=166666666
DS: i=10000000 time=62 ops=161290322
    ✓ set prop@fast mode (124ms)
{}: i=10000000 time=61 ops=163934426
DS: i=10000000 time=60 ops=166666666
    ✓ get prop@fast mode (121ms)
{}: i=10000000 time=428 ops=23364485
DS: i=10000000 time=706 ops=14164305
DS=: i=10000000 time=61 ops=163934426
    ✓ delete prop@fast mode (1196ms)
{}: i=10000000 time=128 ops=78125000
DS: i=10000000 time=61 ops=163934426
    ✓ set prop@dict mode (189ms)
{}: i=10000000 time=198 ops=50505050
DS: i=10000000 time=61 ops=163934426
    ✓ get prop@dict mode (259ms)
{}: i=10000000 time=1074 ops=9310986
DS: i=10000000 time=777 ops=12870012
DS=: i=10000000 time=60 ops=166666666
    ✓ delete prop@dict mode (1913ms)
Object.keys: i=10000000 time=274 ops=36496350
DStruct.keys: i=10000000 time=1901 ops=5260389
    ✓ .keys() (2175ms)
Object.values: i=10000000 time=2628 ops=3805175
DStruct.values: i=10000000 time=2518 ops=3971405
    ✓ .values() (5146ms)
Object#hasOwnProperty exists: i=10000000 time=146 ops=68493150
Object#hasOwnProperty not exists: i=10000000 time=182 ops=54945054
DStruct#has exists: i=10000000 time=58 ops=172413793
DStruct#has not exists: i=10000000 time=64 ops=156250000
DStruct#has undefined key: i=10000000 time=58 ops=172413793
    ✓ #has() (509ms)
DStruct#hasKey exists: i=10000000 time=149 ops=67114093
DStruct#hasKey not exists: i=10000000 time=184 ops=54347826
    ✓ #hasKey() (333ms)