Single precision float emulation in Javascript (float32)

Is it possible to someh开发者_开发百科ow emulate single precision float in Javascript? According to Doug Crockford's blog "Number is 64-bit floating point", but I have to use single one for porting C++ algorithm which calculates single precision float's error.

The ES6 standard has Math.fround() which converts a float64 to float32 and then back again, effectively rounding the float to float32 precision. See this article for details.

Try this JavaScript function. It uses .toFixed(6) to round off the number to six decimal places.

function ToSingle(s) {
 s = s.toString().toUpperCase();
 if (s.indexOf("E") == -1) s = parseFloat(s).toExponential().toUpperCase();
 if (s.indexOf("E") == -1) return s

 var o = s.split("E");
 var s1 = o[0];

 if (s1.indexOf(".") == -1) return s
 if (s1.split(".")[1].length < 7) return s;

 var num = parseFloat(s1);
 if (num + "" == "NaN") return s;

 return num.toFixed(6) + "E" + o[1];
}