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/*Given a non-negative integer represented as a non-empty array of digits, plus one to the integer.

You may assume the integer do not contain any leading zero, except the number 0 itself.

The digits are stored such that the most significant digit is at the head of the list.*/

/**

* @param {number[]} digits

* @return {number[]}

*/

var plusOne = function(digits) {

// var num = Number.parseInt(digits.join(''))

// return (""+(num+1)).split('').map(Number)

for(var i=digits.length-1; i>=0; i--){

if(digits[i] != 9){

digits[i]++

return digits

}

else{

digits[i] = 0

}

}

digits.unshift(1)

return digits

};