_createMathOperation.js
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_createMathOperation.js
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			var baseToNumber = require('./_baseToNumber'),
			baseToString = require('./_baseToString');

			/**
			* Creates a function that performs a mathematical operation on two values.
			*
			* @private
			* @param {Function} operator The function to perform the operation.
			* @param {number} [defaultValue] The value used for `undefined` arguments.
			* @returns {Function} Returns the new mathematical operation function.
			*/
			function createMathOperation(operator, defaultValue) {
			return function(value, other) {
			var result;
			if (value === undefined && other === undefined) {
			return defaultValue;
			}
			if (value !== undefined) {
			result = value;
			}
			if (other !== undefined) {
			if (result === undefined) {
			return other;
			}
			if (typeof value == 'string' \|\| typeof other == 'string') {
			value = baseToString(value);
			other = baseToString(other);
			} else {
			value = baseToNumber(value);
			other = baseToNumber(other);
			}
			result = operator(value, other);
			}
			return result;
			};
			}

			module.exports = createMathOperation;