String.fromCodePoint(42); // "*"String.fromCodePoint(65, 90); // "AZ"String.fromCodePoint(0x404); // "\u0404"String.fromCodePoint(0x2f804); // "\uD87E\uDC04"String.fromCodePoint(194564); // "\uD87E\uDC04"String.fromCodePoint(0x1d306, 0x61, 0x1d307); // "\uD834\uDF06a\uD834\uDF07"String.fromCodePoint("_"); // RangeErrorString.fromCodePoint(Infinity); // RangeErrorString.fromCodePoint(-1); // RangeErrorString.fromCodePoint(3.14); // RangeErrorString.fromCodePoint(3e-2); // RangeErrorString.fromCodePoint(NaN); // RangeError

// String.fromCharCode() alone cannot get the character at such a high code point// The following, on the other hand, can return a 4-byte character as well as the// usual 2-byte ones (i.e., it can return a single character which actually has// a string length of 2 instead of 1!)console.log(String.fromCodePoint(0x2f804)); // or 194564 in decimal

/*! http://mths.be/fromcodepoint v0.1.0 by @mathias */if (!String.fromCodePoint) {  (function () {    var defineProperty = (function () {      // IE 8 only supports `Object.defineProperty` on DOM elements      try {        var object = {};        var $defineProperty = Object.defineProperty;        var result = $defineProperty(object, object, object) && $defineProperty;      } catch (error) {}      return result;    })();    var stringFromCharCode = String.fromCharCode;    var floor = Math.floor;    var fromCodePoint = function () {      var MAX_SIZE = 0x4000;      var codeUnits = [];      var highSurrogate;      var lowSurrogate;      var index = -1;      var length = arguments.length;      if (!length) {        return "";      }      var result = "";      while (++index < length) {        var codePoint = Number(arguments[index]);        if (          !isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`          codePoint < 0 || // not a valid Unicode code point          codePoint > 0x10ffff || // not a valid Unicode code point          floor(codePoint) != codePoint // not an integer        ) {          throw RangeError("Invalid code point: " + codePoint);        }        if (codePoint <= 0xffff) {          // BMP code point          codeUnits.push(codePoint);        } else {          // Astral code point; split in surrogate halves          // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae          codePoint -= 0x10000;          highSurrogate = (codePoint >> 10) + 0xd800;          lowSurrogate = (codePoint % 0x400) + 0xdc00;          codeUnits.push(highSurrogate, lowSurrogate);        }        if (index + 1 == length || codeUnits.length > MAX_SIZE) {          result += stringFromCharCode.apply(null, codeUnits);          codeUnits.length = 0;        }      }      return result;    };    if (defineProperty) {      defineProperty(String, "fromCodePoint", {        value: fromCodePoint,        configurable: true,        writable: true,      });    } else {      String.fromCodePoint = fromCodePoint;    }  })();}

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This page was last modified on⁨23 ene 2024⁩ byMDN contributors.