Using Javascript to Check if Value is Not Null

We can easily use JavaScript to check if a value is not null by using the conditional operation not equal to, !=. Let’s see this below.

if( value1 != null ){
  //Value is not Null
}

And here it is with a very simple example.

var value1 = 1; 
if( value1 != null ){
  console.log("value1 is not null");
}

#Output
value1 is not null

And it’s as simple as that. Now let’s see the not null check used in an example to remove null values from an array.

We can use JavaScript to remove null values from an array by making use of a for loop with an if conditional statement and the not null conditional operator !=. Here is a simple function we will create to remove nulls from an array.

function removeNullValues(arr){
  var new_array = [];
  for (var i=0; i<arr.length; i++){
    if( arr[i] != null ){
      new_array.push(arr[i]);
    }
  }
  return new_array;
};

In the function above, we simply create a new array, loop through all the values of the old array, and only add values that are not null to the new array.

Notice above we also make use of the push() method. This simply adds the element to the end of the array.

And here is our function in use with an example array.

var array_of_strings = ["This",null,"is","an","array",null,"with","null",null,"values","."];

function removeNullValues(arr){
  var new_array = [];
  for (var i=0; i<arr.length; i++){
    if( arr[i] != null ){
      new_array.push(arr[i]);
    }
  }
  return new_array;
};

console.log(removeNullValues(array_of_strings));

#Output:
['This', 'is', 'an', 'array', 'with', 'null', 'values', '.']

Hopefully this article has been useful for you to learn how to use Javascript to check if a value is not null.