Remove exponents from a number in scientific notation, and return "normal" values

noExponents.coffee

String::noExponents = (explicitNum = true) ->
  ###
  # Remove scientific notation from a number
  #
  # After
  # http://stackoverflow.com/a/18719988/1877527
  ###
  data = @.split /[eE]/
  if data.length is 1
    return data[0]
  # Initialize
  z = ""
  sign = if @.slice(0,1) is "-" then "-" else ""
  str = data[0].replace ".", ""
  mag = Number(data[1]) + 1
  # Deal with negative exponents
  if mag <= 0
    z = sign + "0."
    # Add zeros until we hit mag = 0
    until mag >= 0
      z += "0"
      ++mag
    # Append all the trailing digits
    num = z + str.replace /^\-/, ""
    if explicitNum
      return parseFloat num
    else
      return num
  # Positive exponents
  if str.length <= mag
    # There will be no trailing decimals
    mag -= str.length
    # Loop until we hit zero
    until mag <= 0
      z += 0
      --mag
    num = str + z
    if explicitNum
      return parseFloat num
    else
      return num
  else
    # Need to handle the trailing decimal case
    leader = parseFloat data[0]
    multiplier = 10 ** parseInt data[1]
    return leader * multiplier
    


Number::noExponents = ->
  strVal = String @
  strVal.noExponents(true)

noExponents.js

  String.prototype.noExponents = function(explicitNum) {
    var data, leader, mag, multiplier, num, sign, str, z;
    if (explicitNum == null) {
      explicitNum = true;
    }

    /*
     * Remove scientific notation from a number
     *
     * After
     * http://stackoverflow.com/a/18719988/1877527
     */
    data = this.split(/[eE]/);
    if (data.length === 1) {
      return data[0];
    }
    z = "";
    sign = this.slice(0, 1) === "-" ? "-" : "";
    str = data[0].replace(".", "");
    mag = Number(data[1]) + 1;
    if (mag <= 0) {
      z = sign + "0.";
      while (!(mag >= 0)) {
        z += "0";
        ++mag;
      }
      num = z + str.replace(/^\-/, "");
      if (explicitNum) {
        return parseFloat(num);
      } else {
        return num;
      }
    }
    if (str.length <= mag) {
      mag -= str.length;
      while (!(mag <= 0)) {
        z += 0;
        --mag;
      }
      num = str + z;
      if (explicitNum) {
        return parseFloat(num);
      } else {
        return num;
      }
    } else {
      leader = parseFloat(data[0]);
      multiplier = Math.pow(10, parseInt(data[1]));
      return leader * multiplier;
    }
  };

  Number.prototype.noExponents = function() {
    var strVal;
    strVal = String(this);
    return strVal.noExponents(true);
  };