Question

My script is building a file that consists of bytes \xdd where dd – hex number.
The problem is obvious:

"\x" + "4c" != "\x4c" ;

and therefore I can generate a byte only using
huge array like

{ 
    '00' : '\x00',
    '01' : '\x01',
    ... etc. 
}

Is there a better solution?

Answer 1

See String.fromCharCode which can turn a Unicode codepoint (in the BMP) into the appropriate “character” (string with a length of one).

Note that in JavaScript a string is a sequence of Unicode codepoints in the BMP. Characters requiring surrogate pairs are another story. The link includes a “fix” for this.

String.fromCharCode(0x42) == "\x42" // true

Happy coding.