Function parseFloat_

src/dygraph-utils.js:1096–1115

(x, opt_line_no, opt_line)

 * @param {string=} opt_line The text of the line from which the string comes.
 */
export function parseFloat_(x, opt_line_no, opt_line) {
  var val = parseFloat(x);
  if (!isNaN(val)) return val;

  // Try to figure out what happeend.
  // If the value is the empty string, parse it as null.
  if (/^ *$/.test(x)) return null;

  // If it was actually "NaN", return it as NaN.
  if (/^ *nan *$/i.test(x)) return NaN;

  // Looks like a parsing error.
  var msg = "Unable to parse '" + x + "' as a number";
  if (opt_line !== undefined && opt_line_no !== undefined) {
    msg += " on line " + (1+(opt_line_no||0)) + " ('" + opt_line + "') of CSV.";
  }
  console.error(msg);

  return null;
}

// Label constants for the labelsKMB and labelsKMG2 options.
// (i.e. '100000' -> '100k')