随笔分类 - Javascript
摘要：Instances of most built-in constructors also use a mechanism that is not intercepted by Proxies. They therefore can’t be wrapped transparently, either
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摘要：For a Proxy, function signature looks like: const target = {} const handler = { get(target, propKey) { return Reflect.get(target, propKey) } } const p
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摘要：_.omitBy and its sibling _.pickBy are popular utilities which apply filter-like functionality to objects. Both of them accept a function to determine
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摘要：Remove duplicates elements from an array is a common array task Javascript offers different alternatives to accomplish it. You can use a mix of method
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摘要：When needing to format a number I've tended to lean towards Number.prototype.toFixed(), reach for a 3rd party library, or write custom functions. Howe
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摘要：The ability to natively format dates and times using the browser is impressive. You may find yourself not needed to grab libraries such as moment.js o
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摘要：JavaScript numbers and CSS hexadecimal numbers don't play very well together. You can solve this with a conversion function that takes the number, con
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摘要：State + Event + Interpreter: const machine = { initial: "idle", states: { idle: { on: { FETCH: "pending", }, }, pending: { on: { RESOLVE: "resolved",
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摘要：import './assets/css/style.css'; const app = document.getElementById('app'); app.innerHTML = ` <div class="todos"> <div class="todos-header"> <h3 clas
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摘要：Let's see the following code first: let button = document.getElementById("button"); button.addEventListener("click", (e) => { console.log(e) }); We ha
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摘要：Macro: refer to webapis, setTimeout, setInterval Micro: refer to Promise based api Execution order Sync Task > Micro Task > Macro Task Example: const
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摘要：Big or non decimal numbers are sometimes hard to read inside code. Numeric separators are now part of the javascript specification and allow us to mak
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摘要：When implementing the store partten, we need to be careful about mutation. class DataStore { private lessons: Lesson[] = []; private lessonsSubject =
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摘要：const app = document.getElementById('app'); app.innerHTML = ` <h1>JavaScript DOM</h1> <ul id="list"> <li>1</li> <li>2</li> <li>3</li> <li>4</li> </ul>
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摘要：const app = document.getElementById('app'); app.innerHTML = ` <h1>JavaScript DOM</h1> <div class="item"></div> `; const item = document.querySelector(
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摘要：In this lesson we will learn about how to define real private properties in javascript classes. Before: class Pasta { constructor(name) { this._name =
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[Javascript] Create an Async Generator and Loop Through Generated Promises with "For Await Of" Loops
摘要：Generators can yield promises which can work with the "for await of" loop syntax. This lesson shows how all the pieces fit together and explains why t
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摘要：The "for await of" loop syntax enables you to loop through an Array of Promises and await each of the responses asynchronously. This lesson walks you
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摘要：NaN == NaN // false NaN NaN // false Object.is(NaN, NaN) // true Number.isNaN(NaN) // true typeof NaN // number Because NaN is number type, so there i
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