javascript - bizzare undefined variable -


I have a multi-dimensional array in which there are objects, and if I am in a particular property, then I I want to remove

COFFEESCRIPT 

  For the data columns in the Bent Spinner for all data columns, I have data in column console.log i, brentSpiner.refreshRate # DataColumn.remove i If BrentSpinner .refreshRate-1   
 above  console.log  works as expected when the line is commented below   data columns, I will call the data in column console.log i, brentSpiner.refreshRate dataColumn.remove i if brentSpiner.refreshRate -1, then the above errors Reference is:  brentSpiner console.log (i, Brentspinrkfresseret);  In the firebug  
 How to be undefined on Earth by the presence of a second line can be the variable in the above line?  
  Rendered JavaScript   
 failed  
 for  (_i = 0, _len = allDataColumns.length; _i & Lt; _len; _i ++) {dataColumn = allDataColumns [_i]; For (i = _j = 0, _len1 = data column.Lambi; _j & lt; _len1; i = ++ _ j) {brent spinner = data column [i]; Console.log (i, brentspinner refresh rate); If (brentSpiner.refreshRate === -1) {dataColumn.remove (i); }}}   
 Works  
 for  (_i = 0, _len = allDataColumns.length; _i & lt; _len; _i ++) {dataColumn = AllDataColumns [_i]; For (i = _j = 0, _len1 = data column.Lambi; _j & lt; _len1; i = ++ _ j) {brent spinner = data column [i]; Console.log (i, brentspinner refresh rate); }}   
 (Side note: Array has been added to the prototype via Removal)  
  UPDATE   
 This was a logic error in my part to see the accepted response to see why it is that what I was doing and worked well:  
  data columns in all the data columns For i = 0 len = data columns. Length When I & lt; Len If Data Column [i] .refreshRate -1 is -1 Data Column. For Rally i Lane - i ++   
 Rated  
  = 0, _len = allDataColumns .length; _i & lt; _len; _i ++) {Data Column = All Data Columns [_i]; I = 0; Len = dataColumn.length; While (i & lt; len) {if (Data column [i] .refreshRate === -1] {dataColumn.remove (i); Len--; } I ++; }}    
 
 
 Coffeescript "code" _len1 is the length of the list "freezing" . When you remove an entry, you will participate in the inner loop at the end of the list.  
 Looks like a bug for me (unless there is no language facility, by which you should inform the coffeeclass that the length of the array can change.)

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