Transform numbers into elements of an array and replace undefined with an empty array

Question

Transform numbers into elements of an array and replace undefined with an empty array

Check out this Plunker example where a filter is implemented to allow select box options to be selected only once: http://plnkr.co/edit/BBqnTlxobUpiYxfhyJuj?p=preview

.filter('arrayDiff', function() {
return function(array, diff) {
  console.log(diff);
  var i, item, 
      newArray = [],
      exception = Array.prototype.slice.call(arguments, 2);

  for(i = 0; i < array.length; i++) {
    item = array[i];
    if(diff.indexOf(item) < 0 || exception.indexOf(item) >= 0) {
      newArray.push(item);
    }
  }

  return newArray;

};
});

I'm in need of a similar filter, however, my variable diff is not an array but a number representing the selected value (either 1, 2, 3, or undefined): In this context, diff can be either 1,2,[3], or []. How can I modify the filter to work with a number instead of an array? Here's how I am currently using the filter: http://plnkr.co/edit/L9hBa5LapAV76wHrwRnX?p=preview

javascript angularjs arrays

Answer 1

Answer №1

Here is an example code snippet:

.filter('arrayDifference', function() {
return function(arr, difference) {
  console.log(difference);
  var idx, itm, 
      newArr = [],
      excludeList = Array.prototype.slice.call(arguments, 2);

  for(idx = 0; idx < arr.length; idx++) {
    itm = arr[idx];
    if(difference == itm || excludeList.indexOf(itm) >= 0) {
      newArr.push(itm);
    }
  }

  return newArr;

};
});

Answer 2

Here is an example code snippet:

.filter('arrayDifference', function() {
return function(arr, difference) {
  console.log(difference);
  var idx, itm, 
      newArr = [],
      excludeList = Array.prototype.slice.call(arguments, 2);

  for(idx = 0; idx < arr.length; idx++) {
    itm = arr[idx];
    if(difference == itm || excludeList.indexOf(itm) >= 0) {
      newArr.push(itm);
    }
  }

  return newArr;

};
});

Transform numbers into elements of an array and replace undefined with an empty array

Answer №1

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