+1 Array

+1 Array

// Started on 12/27/2015, Got back to this question on 1/4/2016
// +1 Array
// Given an array of integers of any length, return an array that has 1 added 
// to the value represented by the array.

// For example an array [2, 3, 9] equals 239, add one would return an 
// array [2, 4, 0].

// [4, 3, 2, 5] would return [4, 3, 2, 6]

// The array can't be empty and only positive, single digit integers are allowed. 
// The function should return null if the array is empty or any of the array 
// values are negative or more than 10.

// [1, -9] would return null/nil/None (according to the language implemented).

// Test.assertSimilar(upArray([2,3,9]), [2,4,0]);
// Test.assertSimilar(upArray([4,3,2,5]), [4,3,2,6]);
// Test.assertSimilar(upArray([1,-9]), null);

function upArray(arr){
    // console.log("input array: ",arr)
    // console.log(arr.length)
    
    if(arr.length === 0){
        console.log('is this code running')
        return null;
    }
    
    for(var i=0;i<arr.length;i++){
        if(arr[i]<0 || arr[i]>10){
            return null;
        }
    }
    
    if(numberLook!==9){
      arr[arr.length-1]= arr[arr.length-1]+1
    }
    
    var n=1
    var numberLook =arr[arr.length-n]
    if (numberLook === 9) {
        numberLook = 10
    }

  while (numberLook === 10) {
        
      if (arr.length - n === 0) {
          if (numberLook === 10) {
             arr[arr.length-n] = 0;
             arr.unshift(1)
             numberLook = 1;
          }
      }
     else {
         arr[arr.length-n] = 0;
         arr[arr.length-n-1] += 1;
         n++;
         numberLook = arr[arr.length-n]
     }
  }
    return arr;
}

// some edge case such as [9,8,9] , [9,9,9]. Now all cases will pass the test.

// Basic tests
// input array: [ 5, 7, 4 ]
// Test Passed: Value == [5,7,5]
// input array: [ 9, 9, 9 ]
// Test Passed: Value == [1,0,0,0]
// input array: [ 2, 1, 4, 7, 4, 8, 3, 6, 4, 7 ]
// Test Passed: Value == [2,1,4,7,4,8,3,6,4,8]
// Invalids array
// input array: [ 1, 2, 33 ]
// Test Passed: Value == null
// input array: [ 1, 2, -1 ]
// Test Passed: Value == null
// input array: []
// is this code running
// Test Passed: Value == null
// 'Big' arrays
// input array: [ 9, 2, 2, 3, 3, 7, 2, 0, 3, 6, 8, 5, 4, 7, 7, 5, 8, 0, 7 ]
// Test Passed: Value == [9,2,2,3,3,7,2,0,3,6,8,5,4,7,7,5,8,0,8]