Replacing null values in an array

[marsh stag]

<@&987246883653156906> please have a look, thanks.

[marsh stag]

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[wraith knoll]

I have a function that's supposed to take in values and replace any null values in an array with these values. If there are no null values, then it shouldn't replace anything.
Everything works fine, except that when it runs out of null values it still replaces index 0 of the array with a value. The reason that happens is because the .orElse(0) directs it to index 0, but I can't get rid of it or else none of it works.

    public void pickUp(String val){
        int null_index;
        
        null_index = IntStream.range(0, inventory.length)
        .filter(i -> inventory[i] == null)
        .findFirst()
        .orElse(0);

        inventory[null_index] = val;

[marsh stag]

Detected code, here are some useful tools:

Formatted code

public void pickUp(String val) {
  int null _index;
  null _index = IntStream.range(0, inventory.length).filter(i -> inventory[i]  == null ).findFirst().orElse(0);
  inventory[null _index]  = val;

[vague reef]

instead of orElse you can use ifPresent to check if the optional returned by findFirst() has a value and perform an operation with said value.
For example:
findFirst().ifPresent(index -> array[index] = values);

[fiery gulch]

there Arrays.stream if u didn't knew

[wraith knoll]

Thanks guys. I got it working like this:

    public void pickUp(String val){
        for (int i = 0; i < inventory.length; i++){
            if (inventory[i] == null){
                inventory[i] = val;
                return;
            }
        }
    }

[marsh stag]

Detected code, here are some useful tools:

Formatted code

public void pickUp(String val) {
  for (int i = 0; i < inventory.length; i++) {
    if (inventory[i]  == null ) {
      inventory[i]  = val;
      return ;
    }
  }
}