1var 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 */ 12function 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 38module.exports = createMathOperation; 39