stackoverflown charCodeAt vs codepointat

https://stackoverflow.com/questions/36527642/difference-between-codepointat-and-charcodeat

by UtmostCreator

JavaScript

// charCodeAt() is UTF-16
// codePointAt() is Unicode

/* UTF-16 is generally considered a bad idea today */

const strings = ["o", "four", "to"];
const emojis = ["🐎", "👟"];

function printItemsLength(arr) {
	for (const item of arr) {
  	console.log(item, item.length);
  }
}

printItemsLength(strings);
console.log('================================');
printItemsLength(emojis);
console.log('================================');
console.log("i.charCodeAt(0)", "i".charCodeAt(0)); // 105
console.log("i.charCodeAt(1)", "i".charCodeAt(1)); // 105
console.log("i.codePointAt(0)", "i".codePointAt(0)); // 105
console.log('=============EMOJIS=============');
// getting the decimal (dec) by which you can find them

console.log('===========charCodeAt===========');
// "surrogate pair"
console.log(emojis[0] + '.charCodeAt(0)', emojis[0].charCodeAt(0)); // only half-character - 55357
console.log(emojis[0] + '.charCodeAt(1)', emojis[0].charCodeAt(1)); // only half-character - 55357

console.log('===========codePointAt===========');
console.log(emojis[0] + '.codePointAt(0)', emojis[0].codePointAt(0)); // 128014

console.log('===========charCodeAt===========');
// "surrogate pair"
console.log(emojis[1] + '.charCodeAt(0)', emojis[1].charCodeAt(0)); // only half-character - 55357
console.log(emojis[1] + '.charCodeAt(1)', emojis[1].charCodeAt(1)); // only half-character - 55357

console.log('===========codePointAt===========');
// full-character
console.log(emojis[1] + '.codePointAt(0)', emojis[1].codePointAt(0)); // 128095
console.log(emojis[1] + '.codePointAt(1)', emojis[1].codePointAt(1)); // will return lower surragate (non-displayable character)
// to find this emojis have a look here: https://www.w3schools.com/charsets/ref_emoji.asp