1  var baseToNumber = require('./_baseToNumber'),
 2      baseToString = require('./_baseToString');
 3  
 4  /**
 5   * Creates a function that performs a mathematical operation on two values.
 6   *
 7   * @private
 8   * @param {Function} operator The function to perform the operation.
 9   * @param {number} [defaultValue] The value used for `undefined` arguments.
10   * @returns {Function} Returns the new mathematical operation function.
11   */
12  function createMathOperation(operator, defaultValue) {
13    return function(value, other) {
14      var result;
15      if (value === undefined && other === undefined) {
16        return defaultValue;
17      }
18      if (value !== undefined) {
19        result = value;
20      }
21      if (other !== undefined) {
22        if (result === undefined) {
23          return other;
24        }
25        if (typeof value == 'string' || typeof other == 'string') {
26          value = baseToString(value);
27          other = baseToString(other);
28        } else {
29          value = baseToNumber(value);
30          other = baseToNumber(other);
31        }
32        result = operator(value, other);
33      }
34      return result;
35    };
36  }
37  
38  module.exports = createMathOperation;