kijimaD / roam

Notes written using Emacs Org-roam + denote
https://kijimad.github.io/roam/
GNU General Public License v3.0
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🏜StaleFile | 2024-11-01 #202

Open github-actions[bot] opened 1 month ago

github-actions[bot] commented 1 month ago

memo

実は React はツリー構造の Virtual DOM(仮想 DOM) を構築して差分検知をするライブラリです。 https://zenn.dev/panda_program/articles/deep-dive-into-react

WEB+DB PRESS Vol.106 (Amazon) の「仮想DOM革命 ReactでGUI設計が変わる!

https://en-ambi.com/itcontents/entry/2020/02/18/103000

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kijimaD commented 1 week ago

sync.Pool プールの使い方 組み込み関数new newとmakeの違い

b runtime.printstring c b runtime.growslice

最初のランタイムの準備を飛ばしてから capに余裕があるとgrowsliceしないのを確かめる

go test -bench . -benchmem -count 100

https://github.com/golang/go/blob/bae2e968e2daadd39c1bdb1221648361d7277ddc/src/runtime/slice.go#L291 なぜ足し算? a+aのほうが早いのか?

0.146011 A 0.146791 B

+begin_src go

package main

import "testing"

func BenchmarkAdd(b *testing.B) { a := 42 for i := 0; i < b.N; i++ { _ = a + a } }

func BenchmarkMultiply(b testing.B) { a := 42 for i := 0; i < b.N; i++ { _ = a 2 } }

+end_src

func main() {
    // 要素数0, 容量3
    s := make([]string, 0, 0)
    for i := 0; i <= 12; i++ {
        print("a")
        s = append(s, "a")
    }
}

react query を使う理由。axiosを直接呼び出さない理由