Whats the easiest way to remove null values from an array with a loop (Js)

Question

If I have an array with three text values and two null values. How could those be removed with a loop. Is it possible to use splice to do this.

arrayVal[0] = null
arrayVal[1] = "Some text"
arrayVal[2] = null
arrayVal[3] = "More text"
arrayVal[4] = "Text Again"

I want to achieve the following:

arrayVal[0] = "Some Text"
arrayVal[1] = "More text"
arrayVal[2] = "Text Again"

Look into the splice() function

caffeinated.tech
– caffeinated.tech

2014-04-30 21:14:04 +00:00
Commented Apr 30, 2014 at 21:14 — caffeinated.tech
– caffeinated.tech, Commented Apr 30, 2014 at 21:14

elclanrs · Accepted Answer · 2014-04-30 21:14:37Z

6

Here's a way to do it:

arrayVal.filter(Boolean);

Note that Boolean will remove any falsy value, that includes zero, empty string, null, undefined.

answered Apr 30, 2014 at 21:14

elclanrs

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2 Comments

Bergi Over a year ago

function(x){return x!=null} wouldn't be that hard to write as well

Anon Omus Over a year ago

Perfect, simple and effective.

The One and Only ChemistryBlob · Accepted Answer · 2014-04-30 21:18:49Z

0

This can also be achieved with a for loop;

function removeNull() {
    var arrayVal, newArrayVal, j;
    for (var i = 0; i < arrayVal.length; i++) {
        j = 0;
        if (arrayVal[i]) {
            newArrayVal[j] = arrayVal[i];
            j++;
        }
    }
}

answered Apr 30, 2014 at 21:18

The One and Only ChemistryBlob

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