CODEWITHSUNDEEP
javascript
clamp
clamp

Reputation: 34036

Printing floating point values with decimals and not with e-notation in JavaScript

When i print a floating point like 0.0000001 in JavaScript it gives me

 1e-7

how can i avoid that and instead print it "normally" ?

Upvotes: 1

Views: 1526

Answers (3)

kennebec
kennebec

Reputation: 104800

function noExponent(n){
    var data= String(n).split(/[eE]/);
    if(data.length== 1) return data[0]; 

    var  z= '', sign= +n<0? '-':'',
    str= data[0].replace('.', ''),
    mag= Number(data[1])+ 1;

    if(mag<0){
        z= sign + '0.';
        while(mag++) z += '0';
        return z + str.replace(/^\-/,'');
    }
    mag -= str.length;  
    while(mag--) z += '0';
    return str + z;
}

Upvotes: 2

Brandon Buck
Brandon Buck

Reputation: 7181

I've got a simple solution that appears to be working.

var rx = /^([\d.]+?)e-(\d+)$/;

var floatToString = function(flt) {
  var details, num, cnt, fStr = flt.toString();
  if (rx.test(fStr)) {
    details = rx.exec(fStr);
    num = details[1];
    cnt = parseInt(details[2], 10);
    cnt += (num.replace(/\./g, "").length - 1); // Adjust for longer numbers
    return flt.toFixed(cnt);
  }
  return fStr;
};

floatToString(0.0000001); // returns "0.0000001"

EDIT Updated it to use the toFixed (didn't think about it).

EDIT 2 Updated it so it will display numbers 0.0000000123 properly instead of chopping off and showing "0.00000001".

Upvotes: 0

Ted Hopp
Ted Hopp

Reputation: 234847

You can use this:

var x = 0.00000001;
var toPrint = x.toFixed(7);

This sets toPrint to a string representation of x with 7 digits to the right of the decimal point. To use this, you need to know how many digits of precision you need. You will also need to trim off any trailing 0 digits if you don't want them (say, if x was 0.04).

Upvotes: 4

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