Check if exists in Array

Question

I'm creating a program in Flash using Actionscript 3. I was woundering if I could write an «if-statement» that checks if the text the user inputs is already in an array.

Like, if you have an array:

var alphabet:Array = new Array("a","b","c","d","e")

I want to make a statement like

If ('a' exist in alphabet)

Is there any way I can do that?

It would be nice if you close the question somehow, because it's important to not leave unanswered questions - people keep looking at them as they think they can help. — Andrey Popov
– Andrey Popov, Commented Jun 3, 2014 at 8:29

Andrey Popov · Accepted Answer · 2014-04-08 08:12:14Z

4

You can use indexOf to find if the element is in the Array:

if (alphabet.indexOf('c') != -1) {
    // the element is there
}

indexOf actually returns the position at which the element is found, and -1 if the element is missing. So this is a simple check.

answered Apr 8, 2014 at 8:12

Andrey Popov

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Comments

konsnos · Accepted Answer · 2014-04-08 12:08:56Z

0

If your array is filled with random entries, you should parse the array one by one.

You can create a function which you supply the parameters of the array and the string you search for like this one.

static public function checkIfExists(txt:String, array:Array):Boolean 
{
    for (var i:int = 0; i < array.length; i++) 
    {
        if (array[i] == txt) 
        {
            return true;
        }
    }
    return false;
}

Then you can call it by

checkIfExists('a', alphabet);

answered Apr 8, 2014 at 12:08

konsnos

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