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在nan javascript這個產品中，有2篇Facebook貼文，粉絲數超過10萬的網紅BorntoDev，也在其Facebook貼文中提到， 💡 เพื่อน ๆ มือใหม่หัดเขียน JavaScript หลาย ๆ คนอาจจะเคยเห็นเครื่องหมาย ?? และ || ในโปรแกรมแล้วไม่รู้ว่ามันคืออะไร และทำงานยังไง วันนี้เรามาไขข้อสงสัยก...

nan javascript 在 BorntoDev Facebook 的精選貼文

BorntoDev By BorntoDev

2021-08-09 15:33:42 有 132 人按讚
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💡 เพื่อน ๆ มือใหม่หัดเขียน JavaScript หลาย ๆ คนอาจจะเคยเห็นเครื่องหมาย ?? และ || ในโปรแกรมแล้วไม่รู้ว่ามันคืออะไร และทำงานยังไง วันนี้เรามาไขข้อสงสัยกันเถอะ !! กับสรุปสั้น ๆ วิธีการใช้งาน Nullish Coalescing Operator
.
มันคืออะไร และใช้งานยังไง หากพร้อมแล้วไปอ่านกันเลยจ้าาาาา~~
.
🌟 Nullish Coalescing Operator
.
Nullish Coalescing (??)
เป็นตัวดำเนินการตรรกะที่จะ Return ค่าทางขวามือเมื่อค่าทางซ้ายเป็น Null หรือ Undefined
.
👨‍💻 Syntax
leftExpr ?? rightExpr
.
📑 ตัวอย่าง
const name1 = null ?? 'Oreo';
console.log(name1);

//output => Oreo
.
OR (||) - เป็นตัวดำเนินการตรรกะ จะ Return ค่าทางขวามือหากทางซ้ายมือเป็นเท็จ (0, ' ', NaN, null, undefined)
.
📑 ตัวอย่าง
let tu = null;
let text = tu || 'stupid!';
console.log(text); // output => stupid!
.
สามารถใช้ร่วมกับ OR (||) และ AND (&&) ได้แต่ต้องใช้วงเล็บ () เพื่อจัดลำดับความสำคัญของตัวดำเนินการด้วยนะ !!
.
📑 ตัวอย่าง OR (||)
let y = (false || true) ?? "foo"
console.log(y) // output => true
.
📑 ตัวอย่าง AND (&&)
let x = (false && true) ?? "foo"
console.log(x) //output => false
.
💥 Source : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing_operator
.
borntoDev - 🦖 สร้างการเรียนรู้ที่ดีสำหรับสายไอทีในทุกวัน

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BorntoDev (www.BorntoDev.com) เว็บไซต์ที่เกี่ยวกับการสอนการพัฒนาโปรแกรมหรือผลงานทางด้านคอมพิวเตอร์ จัดทำขึ้นเมื่อ 27 ตุลาคม 2556 โดยมีจุดมุ่งหมายเพื่อต้องการให้ผู้ที่สนใจพัฒนาซอฟต์แวร์ แอปพลิเคชั่น หรือ ผลงานทางด้านคอมพิวเตอร์ได้มีแหล่งในการเรียนรู้ที่ง่าย และ สนุก ไม่เน้นทฤษฏีจนทำให้ท้อหรือถอดใจไปก่อนจัดทำขึ้นโดยกลุ่มคนที่ต้องการจะเห็นความเปลี่ยนแปลงทางด้านเทคโนโลยี และ มีความหวังว่าจะมีนักพัฒนารุ่นใหม่ของไทยที่มีผลงานที่ยิ่งใหญ่ขึ้นมาได้ โดยจะใช้หลักการ “เน้นสนุก สอนเข้าใจ ทำได้จริง” สามารถเข้ามาเรียนรู้การพัฒนาซอฟต์แวร์ได้ตั้งแต่ระดับมัธยมศึกษาจนถึงนักศึกษาในมหาวิทยาลัย และ บุคคลทั่วไปที่สนใจในการพัฒนาซอฟต์แวร์และเทคโนโลยีคอมพิวเตอร์ ซึ่งในปัจจุบันนี้ถือว่ามีความสำคัญกับทุกสาขาอาชีพ และ เข้ามาเกี่ยวข้องกับทุกๆอย่างในชีวิตของเรา
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nan javascript 在 Scholarship for Vietnamese students Facebook 的最佳貼文

Scholarship for Vietnamese students By Scholarship for Vietnamese students

2018-10-26 21:57:43 有 582 人按讚
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[5 nguồn khoá học Free và chứng nhận Free]

Khi đăng kí học các khoá học online trên EdX hay Coursera, mặc dù chúng ta được học miễn phí hầu như toàn bộ giáo trình, thế nhưng để có được giấy chứng nhận sau khi hoàn tất khoá học đó, mọi người thường phải trả một món tiền “kha khá” vào khoảng $32. Vì vậy hôm nay, để giải quyết vấn đề nan giải đó, Scholarship for Vietnamese students sẽ giới thiệu với các bạn 5 website cung cấp các khoá học online miễn phí cùng giấy chứng nhận để chúng ta có thể làm đẹp hơn CV nhé. Tin hay thế này Schofans nhớ tag thêm bạn bè để học chung nha.

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Nếu bạn đem mê với nền giáo dục của Úc, đây là một website dành cho bạn. Ở đây có rất nhiều các khoá học với đa dạng lĩnh vực. Mỗi khoá học thường kéo dài trong vòng 4 tuần. Vào kì thi cuối khoá, nếu số điểm của bạn được trên 60%, bạn sẽ nhận được giấy chứng nhận do Open Universities của Úc cung cấp.

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Aquent Gymnasium cung cấp những 9 khoá học miễn phí liên quan đến công nghệ như quản trị và thiết kế web, Javascript cũng như các khoá học về lĩnh vực truyền thông. Điều kiện để nhận được giấy chứng nhận là bạn cần đạt ít nhất 85% số điểm ở bài thi cuối khoá.

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#7. NaN & Infinity - iT 邦幫忙

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#50. NaN - JavaScript: The Good Parts [Book] - O'Reilly Media

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#56. nan - npm

Native Abstractions for Node.js: C++ header for Node 0.8 -> 14 compatibility.

#57. JavaScript中的NaN與isNaN - 每日頭條

NaN. NaN 即Not a Number ，不是一個數字。 在JavaScript 中，整數和浮點數都統稱為Number 類型。除此之外，Number 類型還有一個很特殊的值，即NaN 。

#58. JavaScript 中的NaN - 简书

什么是NaN 什么时候会返回NaN 判断NaN 参考什么是NaN 在MDN 的NaN 文章中有描述： 全局属性NaN 表示Not-A-Number 的值。N...

#59. "What's the typeof null?", and other confusing JavaScript Types

The typeof operator in JavaScript evaluates and returns a string with ... The type of NaN , which stands for Not a Number is, surprisingly, ...

#60. Convert NaN to 0 in JavaScript | Using isNan() method OR ...

NaN means in JavaScript is “Not a Number”. When you can expect the NaN Error in JS? One of the common situations when you try to convert string ...

#61. Why JavaScript function returns NaN - MSDN

I've been trying to figure out why my JS function keeps returning a NaN instead of a Float32Array. I'm using this in my razor View page.

#62. JavaScript中如何判断NaN - web开发- 亿速云

这篇文章主要介绍了JavaScript中如何判断NaN，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家 ...

#63. javascript的NaN属性- 云+社区 - 腾讯云

JavaScript 以NaN 的形式输出Number.NaN。请注意，NaN 与其他数值进行比较的结果总 ... NaN 比较来检测一个值是不是数字，而只能调用isNaN() 来比较。

#64. JavaScript 中的NaN - 掘金

JavaScript 中的数字类型是所有数字值的集合，包括“Not A Number”，正无穷和负无穷。 可以使用特殊表达式 NaN 、全局对象或 Number 函数的属性来访问“Not ...

#65. Dr. Chen, Chun-Nan - 財務金融研究所- 國立臺灣科技大學

Ph.D. in Finance, Syracuse University, USA. Research Field：. Corporate Financial Strategy, Financial Market and Institutions, Behaviroal Finance, Empirical ...

#66. Cannot understand this javascript nan practice problem ...

Javascript. Question: Write a function parseFirstInt that takes a string and returns the first integer present in the string.

#67. JavaScript NaN Property

JavaScript NaN Property. Function Reference JavaScript Global Functions. Definition and Usage. The NaN property represents "Not-a-Number" value.

#68. chai.Assertion.NaN JavaScript and Node.js code examples

How to use. NaN. function. in. Assertion. Best JavaScript code snippets using chai.Assertion.NaN(Showing ...

#69. All about NaN in JavaScript - Dhananjay Kumar

For me, The NaN is an error value in the JavaScript. However, technically it is the property of the global object. You get NaN when the ...

#70. JavaScript NaN Explained - Designcise

What Is NaN in JavaScript? · Parsing Numbers · Using NaN as an Operand · Using undefined as an Operand · Using Indeterminate Form · Math Operation ...

#71. JavaScript 05筆記（null、undefined、NaN的區別） | IT人

JavaScript 05筆記（null、undefined、NaN的區別） ... alert(typeof NaN); 結果是number ... alert(NaN= =undefined); false

#72. calculation problem in javascript, showing NaN error - Laracasts

calculation problem in javascript, showing NaN error. Guys iam working with a project Inventory control. i have a purchase order form.

#73. Nan'an Waterfall －East Rift Valley National Scenic Area

Nan 'an Waterfall. Updated：2018-12-03. 24.6k. Share to Facebook · Twit about it! Share to Weibo · LINE it! JavaScript is disabled on your browser.

#74. What is NaN | Codecademy

NaN stands for “Not a Number”. When you passed (cube*6) to console.log() it could not interpret it, so returned NaN. JavaScript always thinks cube() means a ...

#75. NaN, isNaN() & Number.isNaN() | Codementor

If you want to learn more about Object.is you can go to this MDN link. JavaScriptEs6Front end development. Report.

#76. Understand Undefined ,NaN and Null in JavaScript - C# Corner

This article explains undefined, NaN, and null in JavaScript. Two concepts are very important for debugging JavaScript applications.

#77. 神奇的NaN

… 一个特殊的JavaScript 值. (非常特殊). “Not a Number” 是… 1

#78. Everything you need to know about NaN in JavaScript

NaN in JavaScript is a lesser-known but simple to understand topic once we demystified a few things about it such as numeric-value coercion ...

#79. Number 数字- NaN 属性- 《Javascript 简明参考手册》 - 书栈网

NaN 属性语法:说明:注: Javascript 简明参考手册，非常值得收藏和阅读！

#80. JavaScript 数字NaN属性 - 编程字典

JavaScript 数字NaN属性. <html> <head> <script type = "text/javascript"> <!-- function showValue() { var dayOfMonth = 50; if (dayOfMonth < 1 || dayOfMonth > ...

#81. javascript - 从数组中过滤NaN - IT工具网

原文 标签 javascript function filter undefined nan. 我正在尝试从数组中 ... 我知道这可能不是解决此问题的最佳方法，但是考虑到我想使用该开关，是否可以删除NaN？

#82. [Solved] Javascript Why is NaN === NaN false? - Code Redirect

Why does NaN === NaN return false in Javascript?> undefined === undefinedtrue> NaN === NaNfalse> a = NaNNaN> a === afalseOn the documentation page I see ...

#83. [15] 值- NaN、Infinity - CoderBridge

NaN 代表not a number 不是一個數字，但較精確的說法是無效的數字( ... 但是在JavaScript 這個作業有明確定義的產生Infinity 這個值，如果變數成 ...

#84. Number.NaN - JavaScript - W3cubDocs

JavaScript Demo: Number.NaN ... You do not have to create a Number object to access this static property (use Number.NaN ). Property attributes of ...

#85. How to hide NaN (JavaScript) - Pretag

Another possible way to avoid nan is by using an execute JavaScript trigger after the setting the variable value:,how to remove that NaN in ...

#86. 回顾一下NaN,isNaN,Number.isNaN - Javascript - 我是前端

typoef NaN //number; // 偿试转换成数字时，转换失败就会返回NaN ... 对象是JavaScript 语言最主要的数据类型，三种原始类型的值——数值、字符串、 ...

#87. Learn NaN – Getting Started with JavaScript, v2 - Frontend ...

Kyle explains what NaN is, when a NaN will be returned, how to test if a value is ... The "NaN" Lesson is part of the full, Getting Started with JavaScript, ...

#88. How to Check NaN in JavaScript - Weekly Webtips

Checking if a value is NaN in JavaScript can be tricky. This is because, you can't use the typeof operator since the type of NaN is ...

#89. Javascript 中的非空判断undefined,null, NaN的区别 - 51CTO博客

Javascript 中的非空判断undefined,null, NaN的区别，Javascript中的非空判断undefined,null,NaN的区别.

#90. JS中的NaN - 有解無憂

JavaScript 中， NaN 是一個特殊的數字值（ typeof NaN 的結果為 number ），是 not a number 的縮寫，表示不是一個合法的數字， ...

#91. 该Number.NaN 属性表示不

Examples 检查数值是否为数字对NaN的测试请参阅NaN 页面上的针对NaN 的测试。 Specifications 浏览器兼容性另见© 2005–2021 MDN 贡献者。根据知识共享署名-相同方.

#92. Python 和Javascript 的JSON 对接的NaN 问题 - 阅微堂

但 NaN 是一个特例，它在Python 里被转为字符串"NaN"，并且可以被 json.loads 识别。但它无法被Javascript JSON 模块识别。

#93. javascript的nan是什么 - html中文网

在javascript中NaN是代表非数字值的特殊值，可以使用Number的NaN属性来指示某个值不是数字。我们也可以使用isNaN() 全局函数来判断一个值是否是NaN ...

#94. How We Migrated Realm JavaScript From NAN to N-API

The Realm JavaScript team has reimplemented the Realm JS Node.js SDK from the ground up to use N-API. Here we describe how and why.

#95. 【JavaScript入門】今さら聞けない！NaNの使い方と判定方法 ...

NaN とはNot-a-Numberの略で、JavaScriptにおける非数（数字ではないもの）を表す、特別な値です。一般的には、数値を期待していたけど実は数値では ...

#96. JavaScript NaN - w3resource

NaN property can be used to refer an error for a function, provided the function returns a valid number. Syntax NaN. Example of JavaScript NAN - ...

#97. JavaScript: The Definitive Guide: The Definitive Guide - Google 圖書結果

MAX_VALUE is the largest number representable in JavaScript. ... NaN is a special value that indicates that the result of some mathematical operation (such ...