dec2bin.js

import rept from "./rept";
import { ERRORTYPES as error } from "./error";
import isNaN from "./isnan";

export default function dec2bin(input, places) {

  if (input instanceof Error) {
    return number;
  }

  var number = parseInt(input);

  if (!/^-?[0-9]{1,3}$/.test(number) || isNaN(number)) {
    return error.value;
  }

  if (number < -512 || number > 511) {
    return error.num;
  }

  if (number < 0) {
    return (
      "1" +
      rept("0", 9 - (512 + number).toString(2).length) +
      (512 + number).toString(2)
    );
  }

  var result = parseInt(number, 10).toString(2);

  if (typeof places === "undefined") {
    return result;
  } else {

    if (!/^-?[0-9]{1,3}$/.test(places) || isNaN(places)) {
      return error.value;
    }

    if (places < 0) {
      return error.num;
    }

    places = Math.floor(places);

    return places >= result.length
      ? rept("0", places - result.length) + result
      : error.num;
  }
}