Javascript characters to unicode

Converting text to Unicode in javascript

Use String.fromCharCode() like this: String.fromCharCode(parseInt(input,16)). When you put a Unicode value in a string using \u, it is interpreted as a hexdecimal value, so you need to specify the base (16) when using parseInt.,String.fromCharCode(parseInt(input, 16)) as they are 16bit numbers (UTF-16),String.fromCharCode(«0x» + input), parseInt(input, 16) seems to do the job 😉 – Harmen Aug 15 ’11 at 9:18

If you want to create a string based on a non-BMP Unicode code point, you could use Punycode.js’s utility functions to convert between UCS-2 strings and UTF-16 code points:

// `String.fromCharCode` replacement that doesn’t make you enter the surrogate halves separately punycode.ucs2.encode([0x1d306]); // '?' punycode.ucs2.encode([119558]); // '?' punycode.ucs2.encode([97, 98, 99]); // 'abc' 

Answer by Itzayana Meza

Use String.fromCharCode() like this: String.fromCharCode(parseInt(input,16)). When you put a Unicode value in a string using \u, it is interpreted as a hexdecimal value, so you need to specify the base (16) when using parseInt.

Answer by Macy Ward

Instantly share code, notes, and snippets. ,I had to change this for me to work for arabic unicode,can we use uincode values in place of number to accomodate a bigger number ?

I had to change this for me to work for arabic unicode

 var temp = value.charCodeAt(0).toString(16).padStart(4, '0'); 

Answer by Bristol Martin

The String.fromCharCode() method converts Unicode values to characters.,Note: This is a static method of the String object, and the syntax is always String.fromCharCode().,Convert a set of Unicode values into characters:,Convert a Unicode number into a character:

Definition and Usage

The String.fromCharCode() method converts Unicode values to characters.

Answer by Araceli Meadows

Unicode normalization is the process of removing ambiguities in how a character can be represented, to aid in comparing strings, for example.,How JavaScript uses Unicode internally,While a JavaScript source file can have any kind of encoding, JavaScript will then convert it internally to UTF-16 before executing it.,Emojis are part of the astral planes, outside of the first Basic Multilingual Plane (BMP), and since those points outside BMP cannot be represented in 16 bits, JavaScript needs to use a combination of 2 characters to represent them

If the file is fetched using HTTP (or HTTPS), the Content-Type header can specify the encoding:

Content-Type: application/javascript; charset=utf-8

const s3 = 'e\u0301' //é s3.length === 2 //true s2 === s3 //true s1 !== s3 //true 

const s1 = '\u00E9' //é const s3 = 'e\u0301' //é s1 !== s3 

s1.normalize() === s3.normalize() //true 

require('punycode').ucs2.decode('?').length //1 

require('punycode').ucs2.decode('?‍❤️‍?').length //6 [. '?‍❤️‍?'].length //6 

Answer by Vivian Mayer

String.prototype.toUnicode = function () < var uni = [], i = this.length; while (i--) < uni[i] = this.charCodeAt(i); >return «&#» + uni.join(‘;&#’) + «;»; >;,String.prototype.toUnicode = function () < return this.replace(/./g, function (char) < return "&#" + String.charCodeAt(char) + ";"; >); >;,Usage: Call toUnicode() on any string object.,The following script will convert a string to the unicode values using javascript. toUnicode is a extension to String.charCodeAt. The benefit of this function is that it returns the whole string a html unicode format.

Answer by Briana Buckley

Because fromCharCode() is a static method of String, you always use it as String.fromCharCode(), rather than as a method of a String object you created. , The static String.fromCharCode() method returns a string created from the specified sequence of UTF-16 code units. ,BMP characters, in UTF-16, use a single code unit:, Because fromCharCode() only works with 16-bit values (same as the \u escape sequence), a surrogate pair is required in order to return a supplementary character. For example, both String.fromCharCode(0xD83C, 0xDF03) and \uD83C\uDF03 return code point U+1F303 «Night with Stars».

String.fromCharCode(num1) String.fromCharCode(num1, num2) String.fromCharCode(num1, num2, . numN) 

Answer by Stella Fletcher

I am concerned with improving the JavaScript, and TypeScript; ie. HTML is intended to be simple and functional.,This set of questions are related to a project I’ve published for converting characters, or strings, to Hex based Unicode; eg. The build target is ECMAScript version 6, and so far both manual tests and automated JestJS tests show that the toUnicode methods function as intended; for both Browser and NodeJS environments.,The below strings are not the same. The first string has á but the second string is a and a combining mark U+0301

This is regarding the edge-cases and test cases mentioned in the question:

[. characters] // or Array.from(characters) 

console.log( "?".length ) // 2 console.log( [. "?"] ) console.log( "?".split("") )

What if you input something like ?‍?‍?‍?? You get

0x1f468 0x200d 0x1f469 0x200d 0x1f467 0x200d 0x1f466 

console.log("?️‍?️".length) // 7 console.log(Array.from("?️‍?️")) console.log("?‍?‍?‍?".length) // 11 console.log(Array.from("?‍?‍?‍?"))

const a = "álgebra", b = "álgebra" console.log(a === b) // false console.log(a.length, b.length) console.log([. a].join(" , ")) console.log([. b].join(" , ")) console.log([. "हिन्दी"].join(" , ")) // Devanagari script

const a = 'Z͑ͫ̓ͪ̂ͫ̽͏̴̙̤̞͉͚̯̞̠͍A̴̵̜̰͔ͫ͗͢L̠ͨͧͩ͘G̴̻͈͍͔̹̑͗̎̅͛́Ǫ̵̹̻̝̳͂̌̌͘!͖̬̰̙̗̿̋ͥͥ̂ͣ̐́́͜͞' console.log(a.length) // 75 console.log(Array.from(a))

Also, codePointAt takes a number as a parameter.

return character.codePointAt(undefined).toString(16) 

return character.codePointAt().toString(16) 

Both of these work because if the argument is undefined , it defaults to 0 . It’s better to pass 0 explicitly as it is easily understandable. It wasn’t clear why you were passing undefined initially.

return character.codePointAt(0).toString(16) 

Источник

The Ultimate Guide to Converting Characters to Unicode in JavaScript

Learn how to convert characters to Unicode in JavaScript with step-by-step guidance. Understand the key points of Unicode, JavaScript, String.fromCharCode(), and charCodeAt(). Handle encoding errors and follow best practices for working with Unicode.

• Understanding Unicode and JavaScript
• Converting a Unicode Value to a String
• Converting a String Character to an ASCII Number
• Getting the Unicode/Hex Representation of a Symbol
• Converting a Unicode Character to a String Format
• Important Considerations for Working with Unicode in JavaScript
• Other code examples for converting characters to Unicode in JavaScript
• Conclusion
• How to convert character in Unicode in JS?
• How to convert a character into ASCII value in JavaScript?
• How to convert string to UTF 8 format in JavaScript?
• How to convert char to number in JavaScript?

JavaScript is a popular programming language for web development, and Unicode is a universal character encoding system that can represent all characters across all languages in a single encoding system. As a developer, knowing how to convert characters to Unicode in JavaScript is a valuable skill to have. In this guide, we will provide step-by-step guidance on how to convert a character to Unicode in JavaScript. We will cover key points, important points, and helpful points related to Unicode, JavaScript, String.fromCharCode(), charCodeAt(), and UTF-16. By the end of this guide, you will have a clear understanding of how to convert a character to Unicode in JavaScript, and you will be able to handle encoding errors and follow best practices for working with unicode.

Understanding Unicode and JavaScript

Unicode is a character set that was designed to support all the world’s languages. It is a universal character encoding system that can represent all characters across all languages in a single encoding system. Unicode is essential for internationalization and localization of software applications.

JavaScript, on the other hand, is a programming language that is widely used for developing web applications. JavaScript uses Unicode to represent characters in strings. When a JavaScript source file is executed, the encoding of the file is converted to UTF-16.

Unicode Cheatsheet

Before we dive into the details of converting characters to unicode in javascript, it’s important to have a basic understanding of Unicode. Here’s a Unicode cheatsheet that you can use as a reference:

• Unicode is a character set that supports all the world’s languages.
• Unicode defines a unique number for every character, regardless of the platform, program or language.
• UTF-8, UTF-16, and UTF-32 are three different encoding schemes for Unicode.
• UTF-8 is the most commonly used encoding scheme for Unicode on the web.
• UTF-16 is the encoding scheme used by JavaScript to encode strings.

Converting a Unicode Value to a String

To convert a Unicode value to a string in JavaScript, you can use the String.fromCharCode() method. This method takes one or more Unicode values and returns a string.

// Converting a Unicode value to a string console.log(String.fromCharCode(65)); // Output: A 

In this example, we passed the Unicode value 65 to the String.fromCharCode() method, which returned the corresponding string “A”.

Converting a String Character to an ASCII Number

To convert a string character to an ASCII number in JavaScript, you can use the charCodeAt() method. This method takes an index as an argument and returns the ASCII value of the character at that index.

// Converting a string character to an ASCII number console.log("A".charCodeAt(0)); // Output: 65 

In this example, we passed the index 0 to the charCodeAt() method, which returned the ASCII value of the character “A”, which is 65.

Getting the Unicode/Hex Representation of a Symbol

To get the Unicode/hex representation of a symbol in JavaScript, you can use the escape() function or the .toString(16) method.

// Getting the Unicode/hex representation of a symbol console.log(escape("A")); // Output: %u0041 console.log("A".charCodeAt(0).toString(16)); // Output: 41 

In this example, we used both the escape() function and the .toString(16) method to get the Unicode/hex representation of the character “A”.

Converting a Unicode Character to a String Format

To convert a Unicode character to a string format in JavaScript, you can use the String.fromCharCode(parseInt(unicode,16)) method. This method takes a Unicode value in hexadecimal format and returns the corresponding string.

// Converting a Unicode character to a string format console.log(String.fromCharCode(parseInt("0041",16))); // Output: A 

In this example, we passed the Unicode value “0041” in hexadecimal format to the parseInt() method, which converts it to a decimal value of 65. We then passed this value to the String.fromCharCode() method, which returned the corresponding string “A”.

Important Considerations for Working with Unicode in JavaScript

When working with Unicode in JavaScript, there are some important considerations to keep in mind:

• The length property of a string is the count of UTF-16 code units, not characters. This means that supplementary characters, which are represented by two code units, will be counted as two characters.
• String.fromCodePoint() cannot return supplementary characters. To work with supplementary characters, you need to use surrogate pairs.
• String.prototype.normalize() returns the Unicode Normalization Form of the string. This is useful for consistency when working with strings that have diacritical marks or other Unicode characters.
• A character in the surrogate range takes up two 16-bit words. This means that you need to use two charCodeAt() calls to get the Unicode value of a supplementary character.
• Always ensure that the encoding is properly set and use String.prototype.normalize() for consistency.

Other code examples for converting characters to Unicode in JavaScript

In Javascript , for instance, convert string to unicode javascript code example

Use String.fromCharCode() like this: String.fromCharCode(parseInt(input,16)). When you put a Unicode value in a string using \u, it is interpreted as a hexdecimal value, so you need to specify the base (16) when using parseInt.

In Javascript as proof, javascript unicode character

Unicode in Javascript source code : var f\u006F\u006F = 'abc'; console.log(foo)Unicode in Javascript strings : var str = '\uD83D\uDC04'; console.log(str)

Conclusion

In conclusion, we have provided step-by-step guidance on how to convert a character to Unicode in JavaScript. By following the best practices for working with Unicode, you can handle encoding errors and ensure consistency in your code. Unicode is an important system for representing all characters across all languages in a single encoding system, and as it continues to advance, it will become even more essential for internationalization and localization of software applications.

Источник