How to remove empty arrays from an array of arrays?

Question

I have an array of arrays which includes some empty arrays. Exp. [ [Name1],[Name2],[Name3],[],[] ]

I tried using shift and splice (example code given)

function RemoveEmptyArrays(){
  var NameArray = [[Name1],[Name2],[Name3],[],[]];

  for (i = 0; i < NameArray.length; i++) {
      if ( NameArray[i][0] === undefined ) {
         NameArray.splice(  i, 1 );
      }
  }
  Logger.log(arrayvals);
}

Desired Output:

[ [Name1],[Name2],[Name3] ]

Tanaike · Accepted Answer · 2019-05-22 23:06:49Z

2

You want to retrieve from [[Name1],[Name2],[Name3],[],[]] to [ [Name1],[Name2],[Name3] ].

If my understanding is correct, how about this sample script?

Sample script:

var NameArray = [["Name1"],["Name2"],["Name3"],[],[]];
var res = NameArray.filter(function(e) {return e.length})
console.log(res)

Modified script:

If your script is modified, how about this modification?

var NameArray = [["Name1"],["Name2"],["Name3"],[],[]];

for (i = NameArray.length - 1; i >= 0; i--) { // Modified
  if ( NameArray[i][0] === undefined ) {
    NameArray.splice(i, 1);
  }
}
console.log(NameArray);

Reference:

filter()

edited May 22, 2019 at 23:06

answered May 22, 2019 at 22:59

Tanaike

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Paul Ghiran · Accepted Answer · 2019-05-22 23:04:48Z

1

A very simple way to do this is using the spread operator from ES6 and then concat.

'concat' concatenates arrays to another array, and the spread operator takes an array and passes it to a function as if they were parameters (among other things).

Here's a working fiddle

const arr = [['a', 'b', 'c'], ['d', 'e', 'f'], [] ,[]] ;

const result = [].concat(...arr)

console.warn(result);

answered May 22, 2019 at 23:04

Paul Ghiran

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How to remove empty arrays from an array of arrays?

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Sample script:

Modified script:

Reference:

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Sample script:

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