Deleting undefined indexes in array Javascript

This question already has an answer here:

Remove empty elements from an array in Javascript 36 answers

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var array = [];
array[1] = 2;
array[3] = 4;

for(var i = 0; i < array.length; i ++) {
  if(array[i]) {

  } else {
    array.splice(i, 1);
  }
}

console.log(array)

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