mathjs/lib/function/construction/number.js

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.

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

      BigNumber = math.type.BigNumber,
      collection = require('../../type/collection'),

      isCollection = collection.isCollection,
      isNumber = util.number.isNumber,
      isBoolean = util['boolean'].isBoolean,
      isString = util.string.isString;

  /**
   * Create a number or convert a string to a number.
   * When value is a matrix, all elements will be converted to number.
   * @param {String | Number | Boolean | Array | Matrix} [value]
   * @return {Number | Array | Matrix} num
   */
  math.number = function number (value) {
    switch (arguments.length) {
      case 0:
        return 0;

      case 1:
        if (isCollection(value)) {
          return collection.deepMap(value, number);
        }

        if (value instanceof BigNumber) {
          return value.toNumber();
        }

        if (isString(value)) {
          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;
        }

        if (isBoolean(value)) {
          return value + 0;
        }

        if (isNumber(value)) {
          return value;
        }

        throw new math.error.UnsupportedTypeError('number', math['typeof'](value));

      default:
        throw new math.error.ArgumentsError('number', arguments.length, 0, 1);
    }
  };
};