RangeError: argument is not a valid code point
The JavaScript exception "Invalid code point" occurs when NaN values, negative Integers (-1), non-Integers (5.4), or values larger than 0x10FFFF (1114111) are used with String.fromCodePoint().
Message
RangeError: Invalid code point -1 (V8-based) RangeError: -1 is not a valid code point (Firefox) RangeError: Arguments contain a value that is out of range of code points (Safari)
Error type
What went wrong?
String.fromCodePoint() throws this error when passed NaN values, negative Integers (-1), non-Integers (5.4), or values larger than 0x10FFFF (1114111).
A code point is a value in the Unicode codespace; that is, the range of integers from 0 to 0x10FFFF.
Examples
Invalid cases
js
String.fromCodePoint("_"); // RangeError String.fromCodePoint(Infinity); // RangeError String.fromCodePoint(-1); // RangeError String.fromCodePoint(3.14); // RangeError String.fromCodePoint(3e-2); // RangeError String.fromCodePoint(NaN); // RangeError Valid cases
js
String.fromCodePoint(42); // "*" String.fromCodePoint(65, 90); // "AZ" String.fromCodePoint(0x404); // 'Є' (U+0404) String.fromCodePoint(0x2f804); // '你' (U+2F804) String.fromCodePoint(194564); // '你' String.fromCodePoint(0x1d306, 0x61, 0x1d307); // '𝌆a𝌇' 