Using javascript, i want to check if a certain character is 32 bit or not ? How can i do it ? I have tried with charCodeAt() but it didn't work out for 32bit characters.
Any suggestions/help will be much appreciated.
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Please define an example "32bit character".deceze– deceze ♦2016-03-31 10:04:14 +00:00Commented Mar 31, 2016 at 10:04
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2 Answers
The charCodeAt() docs returns integer between 0 to 65535 (FFFF) representing UTF-16 code unit.
If you want the entire code point value, use codePointAt().
You can use the string.codePointAt(pos) to easily check if a character is represented by 1 or 2 code point value .
Values greater than FFFF means they take 2 code units for a total of 32 bits.
function is32Bit(c) {
return c.codePointAt(0) > 0xFFFF;
}
console.log(is32Bit("𠮷")); // true
console.log(is32Bit("a")); // false
console.log(is32Bit("￦")); // falseNote: codePointAt() is provided in ECMAScript 6 so this might not work in every browser. For ECMAScript 6 support, check firefox and chrome.
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function characterInfo(ch) {
function is32Bit(ch) {
return ch.codePointAt(0) > 0xFFFF;
}
let result = `character: ${ch}\n` +
`CPx0: ${ch.codePointAt(0)}\n`;
if(ch.codePointAt(1)) {
result += `CPx1: ${ch.codePointAt(1)}\n`;
}
console.log( result += is32Bit(ch) ?
'Is 32 bit character.' :
'Is 16 bit character.');
}
//For testing
let ch16 = String.fromCodePoint(10020);
let ch32 = String.fromCodePoint(134071);
characterInfo(ch16);
characterInfo(ch32);
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