Print all ASCII characters in Javascript

Question

I need to do something like this:

• Have a variable of some type.
• Run in a loop and assign all possible ASCII characters to this variable and print them one by one.

Is this possible for UNICODE?

Answer 1

I'm not sure exactly how you want to print, but it will be console.log printable ascii

 for(var i=32;i<127;++i) console.log(String.fromCharCode(i)); 

You can document.write then if that is your intention. And if the environment is unicode, it should work for unicode as well.

Answer 2

There are some ASCII characters that cannot be printed, but, for example, to get characters from 32 (space) to 126 (~), you should use:

 var s = ''; for (var i = 32; i <= 127; i++) s += String.fromCharCode(i); 

The Unicode character set has more than 110,000 different characters (see Unicode ), but the regular font does not contain all of them, so you cannot display them. You must indicate what parts of the character space you are interested in.

Answer 3

Others showed how to print printed Ascii characters. You can also print all other Ascii characters, although they are control characters with a system-dependent effect (often without effect). To create a string containing all Ascii characters into a string, you can do this:

 var s = ''; for (var i = 0; i <= 127; i++) s += String.fromCharCode(i); 

Unicode is much more complicated because the Unicode coding space from 0 to 0x10FFFF contains a large number of unassigned code points, as well as codes designated as uncharacteristic. There are also private code points that can be used to designate characters by "private agreement", but do not have generally accepted meaning. Moreover, many Unicode characters are non-propagating, i.e. Designed to be combined with the previous character (for example, turning “from” to “â”), so you cannot print them in a row visually. There is no easy way in JavaScript to determine the class of the corresponding code point from an integer - you may need to read the UnicodeData.txt file, analyze it, and use the information there to classify the code points.

Finally, there is a programming problem that the concept of a JavaScript symbol corresponds to a 16-bit code block (and not a code point), and any Unicode code point exceeding 0xFFFF must be represented using two code blocks (the so-called surrogates). If you use JavaScript in the context of an HTML document and want to print characters in HTML content, the easiest way is to use character names such as 𐐀 (which denotes the Unicode character at code point 10400 hexadecimal) and assign a string to the element's innerHTML property.

If you need to write Unicode character ranges, you can take a look at the Full Unicode Input utility I wrote recently. Its source code illustrates some ways to work with Unicode characters in JavaScript.