Opposite of Number.toExponential in JS

Question

I need to get the value of an extremely large number in JavaScript in non-exponential form. Number.toFixed simply returns it in exponential form as a string, wh

Answer 1

"10000000000000000000000000000000"?

Hard to believe that anybody would rather look at that than 1.0e+31,

or in html: 10³¹. But here's one way, much of it is for negative exponents(fractions):

function longnumberstring(n){
    var str, str2= '', data= n.toExponential().replace('.','').split(/e/i);
    str= data[0], mag= Number(data[1]);
    if(mag>=0 && str.length> mag){
        mag+=1;
        return str.substring(0, mag)+'.'+str.substring(mag);            
    }
    if(mag<0){
        while(++mag) str2+= '0';
        return '0.'+str2+str;
    }
    mag= (mag-str.length)+1;
    while(mag> str2.length){
        str2+= '0';
    }
    return str+str2;
}



input: 1e+30
longnumberstring: 1000000000000000000000000000000
to Number: 1e+30
input: 1.456789123456e-30
longnumberstring: 0.000000000000000000000000000001456789123456
to Number: 1.456789123456e-30
input: 1.456789123456e+30
longnumberstring: 1456789123456000000000000000000
to Number: 1.456789123456e+30
input: 1e+80 longnumberstring: 100000000000000000000000000000000000000000000000000000000000000000000000000000000
to Number: 1e+80