不换的周刊 第41期
Scholar's Weekly 第41期
(封面图片来源于：基于 CC0 协议的 shopify[1])
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周刊中所有高亮的内容都可以点击到指定内容的链接～
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关键词： runtime、Node、JavaScript、WebSocket
FE News
1.Runtime compatibility[2]
相关地址：https://runtime-compat.unjs.io
在不同的 JavaScript 运行时中显示 API 的兼容性。数据是从 runtime-compat-data 检索的，基于 MDN 的格式。
2.对 Node 创始人的采访[3]
相关地址：https://stackoverflow.blog/2024/03/19/why-the-creator-of-node-js-r-created-a-new-javascript-runtime/
!!! tip hint important "小贴士"
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3.sh.msh 一些有用的函数简写[4]
相关地址：https://gist.github.com/tangentstorm/4f271600fc20404150e05c373109551d
如下是部分内容，更多内容可以点击链接。
// sh.mjs: shorthand javascript
// array helpers (apl/j/k)
export const id=x=>x
export const af=(n,x)=>Array(n).fill(x)
export const ii=(n,f)=>{for(let i=0;i<n;i++)f(i)}
export const im=(n,f)=>af(n,0).map((_,i)=>f(i))
export const ia=(n,f)=>im(n,id)
export const at=(a,ixs)=>ixs.map(i=>a[i])
export const io=(xs,ys)=>ys.map([].indexOf.bind(xs))
export const odom=(x,y)=>{
let r=[];
for(let j=0;j<y;j++) for(let i=0;i<x;i++) r.push([i,j]); return r }
4.对比不同 JavaScript 的写法对 V8 的影响[5]
相关地址：https://romgrk.com/posts/optimizing-javascript
下面是举例个别内容，其中有一些不好的写法我也经常用。
// No
enum Position {
TOP = 'TOP',
BOTTOM = 'BOTTOM',
}
/ Yeppers
enum Position {
TOP, // = 0
BOTTOM, // = 1
}
5.WebSockets vs Server-Sent-Events vs Long-Polling vs WebRTC vs WebTransport[6]
相关地址：https://rxdb.info/articles/websockets-sse-polling-webrtc-webtransport.html#performance-comparison
几种实时数据的获取方案之间的对比。
6.microdiff[7]
相关地址：https://github.com/AsyncBanana/microdiff?tab=readme-ov-file
一个零依赖的 JavaScript 对象对比库。
export default function diff(
obj: Record<string, any> | any[],
newObj: Record<string, any> | any[],
options: Partial<Options> = { cyclesFix: true },
_stack: Record<string, any>[] = [],
): Difference[] {
let diffs: Difference[] = [];
const isObjArray = Array.isArray(obj);
for (const key in obj) {
const objKey = obj[key];
const path = isObjArray ? +key : key;
if (!(key in newObj)) {
diffs.push({
type: "REMOVE",
path: [path],
oldValue: obj[key],
});
continue;
}
const newObjKey = newObj[key];
const areCompatibleObjects =
typeof objKey === "object" &&
typeof newObjKey === "object" &&
Array.isArray(objKey) === Array.isArray(newObjKey);
if (
objKey &&
newObjKey &&
areCompatibleObjects &&
!richTypes[Object.getPrototypeOf(objKey)?.constructor?.name] &&
(!options.cyclesFix || !_stack.includes(objKey))
) {
const nestedDiffs = diff(
objKey,
newObjKey,
options,
options.cyclesFix ? _stack.concat([objKey]) : [],
);
diffs.push.apply(
diffs,
nestedDiffs.map((difference) => {
difference.path.unshift(path);
return difference;
}),
);
} else if (
objKey !== newObjKey &&
// treat NaN values as equivalent
!(Number.isNaN(objKey) && Number.isNaN(newObjKey)) &&
!(
areCompatibleObjects &&
(isNaN(objKey)
? objKey + "" === newObjKey + ""
: +objKey === +newObjKey)
)
) {
diffs.push({
path: [path],
type: "CHANGE",
value: newObjKey,
oldValue: objKey,
});
}
}
const isNewObjArray = Array.isArray(newObj);
for (const key in newObj) {
if (!(key in obj)) {
diffs.push({
type: "CREATE",
path: [isNewObjArray ? +key : key],
value: newObj[key],
});
}
}
return diffs;
}
End
!!! pied-piper "交个朋友吧～"
我是不换(书生)，"浪子回头金不换"的不换，"百无一用是书生"的书生，热爱工作，同时在工作之余也热爱开源。
本期周刊到这里就结束了，我们下期再见👋～
参考资料
[1]
shopify: https://www.shopify.com/stock-photos/photos/catching-a-white-crane-in-flight
[2]
Runtime compatibility: https://runtime-compat.unjs.io/
[3]
对 Node 创始人的采访: https://stackoverflow.blog/2024/03/19/why-the-creator-of-node-js-r-created-a-new-javascript-runtime/
[4]
sh.msh 一些有用的函数简写: https://gist.github.com/tangentstorm/4f271600fc20404150e05c373109551d
[5]
对比不同 JavaScript 的写法对 V8 的影响: https://romgrk.com/posts/optimizing-javascript
[6]
WebSockets vs Server-Sent-Events vs Long-Polling vs WebRTC vs WebTransport: https://rxdb.info/articles/websockets-sse-polling-webrtc-webtransport.html#performance-comparison
[7]
microdiff: https://github.com/AsyncBanana/microdiff/blob/master/index.ts
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