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#1323 - Maximum 69 Number
Problem Description
Given a positive integer num consisting only of digits 6 and 9.
Return the maximum number you can get by changing at most one digit (6 becomes 9, and 9 becomes 6).
Solution
/**
* @param {number} num
* @return {number}
*/
var maximum69Number = function(num) {
return +String(num).replace(6, 9);
};