Creating instance of an object in a for loop

Question

I have this code:

  createNewDice = () =>{
    let dice;
    for(var i=0; i < 6; i++){
      dice[i] = new Dice();
    }
    console.log(dice, 'dice')
  }

when I call the method I get an error Cannot set property '0' of undefined

Is this not the way to create a new instance of my class?

Pranav C Balan · Accepted Answer · 2017-01-12 17:27:55Z

1

You are trying to set the property to an undefined variable so before trying to define property initialize variable as an array.

let dice = [];

answered Jan 12, 2017 at 17:27

Pranav C Balan

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Comments

VtoCorleone · Accepted Answer · 2017-01-12 22:47:13Z

1

You need to initialize dice as an array first.

createNewDice = () =>{
  let dice = [];
  for(var i=0; i < 6; i++){
    dice[i] = new Dice();
  }
  console.log(dice, 'dice')
}

Edit for comment -

If you want to name them then do what Pranav suggested in using an object. I would possibly take a different approach than Pranav suggested though and do something along the lines of -

const dice = {
  one: new Dice();
  two: new Dice();
  ...
  six: new Dice();
};

edited Jan 12, 2017 at 22:47

answered Jan 12, 2017 at 17:28

VtoCorleone

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2 Comments

The worm Over a year ago

also how would I name it ? e.g. diceOne, diceTwo etc

Pranav C Balan Over a year ago

@Theworm : use an object and define property name with diceOne, diceTwo, etc...

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