Errors when loading random movie clips from an array as3 - actionscript-3

Question

I am getting closer to finding a solution for the errors being generated when running the code below.
I have three boxes on the stage. The goal is to load one random item from the array without any one item being duplicated in more than one of the three boxes.
Yasuyuki Uno has been very helpful. We are currently trying to solve the following:
Code:
var animalArray: Array = [animal1, animal2, animal3, animal4, animal5, animal6, animal7, animal8, animal9, animal10];
var randArr: Array = [];
var rand: int;
// Get random value for 3 times.
for(var i:int=0,len:int=animalArray.length;i<3;i++,len--){
rand = Math.floor( Math.random() * len); // Generate random integer between 0 and len-1.
randArr.push(animalArray.splice(rand,1)); // Delete a value from original array and add that value to new array.
}
box1.addChild(randArr[0]);
box2.addChild(randArr[1]);
box3.addChild(randArr[2]);
Error Message: Incorrect number of arguments. Expected no more than 0
Any help would be greatly appreciated. Thnx!

Answer 1

Assuming that animal1, animal2, etc are linkage IDs in your library, they are class references so they need to be instantiated using the new operator.
There are a few other non-critical issues with your code that made it hard to understand from my point of view:
Using animal1 instead of Animal1 and so on for class names. Uncapitalized names look like properties or functions, not classes.
Using Array instead of Vector. Vectors give you better errors; had you been using Vectors from the start your problem would be obvious.
Example:
var animalTypes:Vector.<Class> = new <Class>[Animal1, Animal2, Animal3, Animal4, Animal5, Animal6, Animal7, Animal8, Animal9, Animal10];
var randomAnimals:Vector.<DisplayObject> = new <DisplayObject>[];
// Get random value for 3 times.
for (var i:int = 0; i < 3; i++){
// Generate random integer between 0 and length-1.
var randomIndex:int = Math.random() * animalTypes.length;
// Remove a class from original vector.
var randomAnimalType:Class = animalTypes.splice(randomIndex, 1)[0];
// Create an instance of the animal class.
var randomAnimal:DisplayObject = new randomAnimalType();
// Add the instance to the random vector.
randomAnimals.push(randomAnimal);
}
box1.addChild(randomAnimals[0]);
box2.addChild(randomAnimals[1]);
box3.addChild(randomAnimals[2]);

Answer 2

As you check length of animalArray in for expression, it's no need to change variable len.
Also if you want to fill with 3 random items new array, you need to use this code:
const arr: Array = [animal1, animal2, animal3, animal4, animal5, animal6, animal7];
const genArr: Array = [];
var len: int = arr.length;
var n: int = 3;
while(n--) {
const randIndex: int = Math.floor(Math.random()*len); // get random index
genArr.push(arr.splice(randIndex, 1)[0]); // splice returns array, so we need first and exist item
len--; // decrement length as optimized solution of no-read length of array each cycle
}
trace(genArr);