v1
- by bvaughn 9/27/202100
Setup JavaScript
const strings = [
"🟩 Container",
"Lorem ipsum dolor sit amet",
"consectetur adipiscing elit",
"sed do eiusmod tempor incididunt ut labore et dolore magna aliqua",
"Ut enim ad minim veniam",
"quis nostrud 💜exercitation ullamco"
];
ready
function utfDecodeString(array) {
let string = '';
for (let i = 0; i < array.length; i++) {
const char = array[i];
string += String.fromCodePoint(char);
}
return string;
}
function utfEncodeString(string) {
const encoded = new Array(string.length);
for (let i = 0; i < string.length; i++) {
encoded[i] = string.codePointAt(i);
}
return encoded;
}
for (let i = 0; i < strings.length; i++) {
const string = strings[i];
const encoded = utfEncodeString(string);
const decoded = utfDecodeString(encoded);
}
ready
// Credit to https://stackoverflow.com/questions/4877326/how-can-i-tell-if-a-string-contains-multibyte-characters-in-javascript
function surrogatePairToCodePoint(charCode1, charCode2) {
return ((charCode1 & 0x3FF) << 10) + (charCode2 & 0x3FF) + 0x10000;
}
// Read string in character by character and create an array of code points
function utfEncodeString(string) {
const codePoints = [];
let i = 0;
let charCode;
while (i < string.length) {
charCode = string.charCodeAt(i);
if ((charCode & 0xF800) == 0xD800) {
codePoints.push(surrogatePairToCodePoint(charCode, string.charCodeAt(++i)));
} else {
codePoints.push(charCode);
}
++i;
}
return codePoints;
}
function utfDecodeString(array) {
let string = '';
for (let i = 0; i < array.length; i++) {
const char = array[i];
string += String.fromCodePoint(char);
}
return string;
}
for (let i = 0; i < strings.length; i++) {
const string = strings[i];
const encoded = utfEncodeString(string);
const decoded = utfDecodeString(encoded);
}ready
const encodedStringCache = new Map();
// Credit to https://stackoverflow.com/questions/4877326/how-can-i-tell-if-a-string-contains-multibyte-characters-in-javascript
function surrogatePairToCodePoint(charCode1, charCode2) {
return ((charCode1 & 0x3FF) << 10) + (charCode2 & 0x3FF) + 0x10000;
}
// Read string in character by character and create an array of code points
function utfEncodeString(string) {
const cached = encodedStringCache.get(string);
if (cached !== undefined) {
return cached;
}
const codePoints = [];
let i = 0;
let charCode;
while (i < string.length) {
charCode = string.charCodeAt(i);
if ((charCode & 0xF800) == 0xD800) {
codePoints.push(surrogatePairToCodePoint(charCode, string.charCodeAt(++i)));
} else {
codePoints.push(charCode);
}
++i;
}
encodedStringCache.set(string, codePoints);
return codePoints;
}
function utfDecodeString(array) {
let string = '';
for (let i = 0; i < array.length; i++) {
const char = array[i];
string += String.fromCodePoint(char);
}
return string;
}
for (let i = 0; i < strings.length; i++) {
const string = strings[i];
const encoded = utfEncodeString(string);
const decoded = utfDecodeString(encoded);
}