mathjs/lib/function/construction/number.js

module.exports = function (math) {
  var util = require('../../util/index.js');

  /**
   * Create a number or convert a string to a number
   * @param {String | Number | Boolean} [value]
   * @return {Number} num
   */
  math.number = function number (value) {
    switch (arguments.length) {
      case 0:
        return 0;
      case 1:
        var num = Number(value);
        if (isNaN(num)) {
          num = Number(value.valueOf());
        }
        if (isNaN(num)) {
          throw new SyntaxError(value.toString() + ' is no valid number');
        }
        return num;
      default:
        throw new util.error.ArgumentsError('number', arguments.length, 0, 1);
    }
  };
};