Convert character to ASCII code in JavaScript

Convert character to ASCII code in JavaScript

How can I convert a character to its ASCII code using JavaScript?

For example:

get 10 from "\n".

Answer by Jim for Convert character to ASCII code in JavaScript

"\n".charCodeAt(0);  

Answer by Mohsen for Convert character to ASCII code in JavaScript

String.prototype.charCodeAt() can convert string characters to ASCII numbers. For example:

"ABC".charCodeAt(0) // returns 65  

For opposite use String.fromCharCode(10) that convert numbers to equal ASCII character. This function can accept multiple numbers and join all the characters then return the string. Example:

String.fromCharCode(65,66,67); // returns 'ABC'  

Here is a quick ASCII characters reference:

{  "31": "",    "32": " ",    "33": "!",    "34": "\"",    "35": "#",      "36": "$",    "37": "%",    "38": "&",    "39": "'",    "40": "(",      "41": ")",    "42": "*",    "43": "+",    "44": ",",    "45": "-",      "46": ".",    "47": "/",    "48": "0",    "49": "1",    "50": "2",      "51": "3",    "52": "4",    "53": "5",    "54": "6",    "55": "7",      "56": "8",    "57": "9",    "58": ":",    "59": ";",    "60": "<",      "61": "=",    "62": ">",    "63": "?",    "64": "@",    "65": "A",      "66": "B",    "67": "C",    "68": "D",    "69": "E",    "70": "F",      "71": "G",    "72": "H",    "73": "I",    "74": "J",    "75": "K",      "76": "L",    "77": "M",    "78": "N",    "79": "O",    "80": "P",      "81": "Q",    "82": "R",    "83": "S",    "84": "T",    "85": "U",      "86": "V",    "87": "W",    "88": "X",    "89": "Y",    "90": "Z",      "91": "[",    "92": "\\",    "93": "]",    "94": "^",    "95": "_",      "96": "`",    "97": "a",    "98": "b",    "99": "c",    "100": "d",      "101": "e",    "102": "f",    "103": "g",    "104": "h",    "105": "i",      "106": "j",    "107": "k",    "108": "l",    "109": "m",    "110": "n",      "111": "o",    "112": "p",    "113": "q",    "114": "r",    "115": "s",      "116": "t",    "117": "u",    "118": "v",    "119": "w",    "120": "x",      "121": "y",    "122": "z",    "123": "{",    "124": "|",    "125": "}",      "126": "~",    "127": ""  }  

Answer by Marco Altieri for Convert character to ASCII code in JavaScript

If you have only one char and not a string, you can use:

var a = 'A';  var codeA = a.charCodeAt();  

omitting the 0...

Answer by Francisco Presencia for Convert character to ASCII code in JavaScript

While the other answers are right, I prefer this way:

function ascii (a) { return a.charCodeAt(0); }  

Then, to use it, simply:

var lineBreak = ascii("\n");  

I am using this for a small shortcut system:

$(window).keypress(function(event) {    if (event.ctrlKey && event.which == ascii("s")) {      savecontent();      }    // ...    });  

And you can even use it inside map() or other methods:

var ints = 'ergtrer'.split('').map(ascii);  

Answer by Filip Dupanovi for Convert character to ASCII code in JavaScript

For those that want to get a sum of all the ASCII codes for a string:

'Foobar'    .split('')    .map(function (char) {      return char.charCodeAt(0);    })    .reduce(function (current, previous) {      return previous + current;    });  

Or, ES6:

[...'Foobar']    .map(char => char.charCodeAt(0))    .reduce((current, previous) => previous + current)  

Answer by maioman for Convert character to ASCII code in JavaScript

For supporting all UTF-16 (also non-BMP/supplementary characters) from ES6 the string.codePointAt() method is available;

This method is an improved version of charCodeAt which could support only unicode codepoints < 65536 ( 2¹⁶ - a single 16bit ) .

Answer by Yoni for Convert character to ASCII code in JavaScript

I found this open source function inside the javascript-algorithms library:

function convertToAscii(str) {    var result = '';    var currentChar = '';    var i = 0;    for (; i < str.length; i += 1) {      currentChar = str[i].charCodeAt(0).toString(2);      if (currentChar.length < 8) {        while (8 - currentChar.length) {          currentChar = '0' + currentChar;        }      }      result += currentChar;    }    return result;  }  

Answer by Steven de Salas for Convert character to ASCII code in JavaScript

JavaScript stores strings as UTF-16 (double byte) so if you want to ignore the second byte just strip it out with a bitwise & operator on 0000000011111111 (ie 255):

'a'.charCodeAt(0) & 255 === 97; // because 'a' = 97 0 'b'.charCodeAt(0) & 255 === 98; // because 'b' = 98 0 '?'.charCodeAt(0) & 255 === 19; // because '?' = 19 39

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