Get a random number in using a function in JS and reuse that number

Question

I am trying to get a random element within an array, inside an object. I want to reuse that random element for another property in an object.

The problem is the function is trying to generate a random number again every time I call that.

For example, the object.randomWord() will return a different result than the object.wordSplit().

How to make sure all properties reference the same random element?

Thanks.

var object = {
  wordArray: ["falconheavy", "roadster", "tesla", "openai"],
  randomWord: function() {
    return this.wordArray[Math.floor(Math.random() * this.wordArray.length)];
  },
  wordSplit: function() {
    return this.randomWord().split('');
  },
}
console.log(object.randomWord()); //"falconheavy"
console.log(object.wordSplit()); // ["t","e","s","l","a"]

What have you tried so far? LocalStorage, cookies or simply a variable in the object come to mind — Luca Kiebel
– Luca Kiebel, Commented May 2, 2018 at 17:49
Why don't you save the randomWord to a variable, and then split that? — user47589
– user47589, Commented May 2, 2018 at 17:50

Narendra Jadhav · Accepted Answer · 2018-05-02 17:59:05Z

1

One way, In your code you can also do like this

DEMO

var object = {
  wordArray: ["falconheavy", "roadster", "tesla", "openai"],
  randomWord: function() {
    this.randomNo = this.wordArray[Math.floor(Math.random() * this.wordArray.length)];
    return this.randomNo;
  },
  wordSplit: function() {
    return (this.randomNo||'').split('');
  }
}

console.log(object.randomWord()); 
console.log(object.wordSplit());

.as-console-wrapper {max-height: 100% !important;top: 0;}

Another way, As you use to method randomWord() and wordSplit(). Inside of wordSplit() you again getting random number so instead of this you can first get random number and store in variable and again pass that value into wordSplit() for splitting.

DEMO

var object = {
  wordArray: ["falconheavy", "roadster", "tesla", "openai"],
  randomWord: function() {
    return this.wordArray[Math.floor(Math.random() * this.wordArray.length)];
  },
  wordSplit: function(v) {
    return v.split('');
  }
}
let result = object.randomWord();
console.log(result); 
console.log(object.wordSplit(result));

.as-console-wrapper {max-height: 100% !important;top: 0;}

edited May 2, 2018 at 17:59

answered May 2, 2018 at 17:53

Narendra Jadhav

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1 Comment

ngbaoan Over a year ago

This is exactly what I'm looking for. I want to call the object property without storing it to a new variable outside the object. Thanks for the help.

Oliver Baumann · Accepted Answer · 2018-05-02 17:52:58Z

1

I would simply store the result of calling randomWord in a variable, and pass that as an argument to wordSplit, like so:

var object = {
  wordArray: ["falconheavy", "roadster", "tesla", "openai"],
  randomWord: function() {
    return this.wordArray[Math.floor(Math.random() * this.wordArray.length)];
  },
  wordSplit: function(word) {
    return word.split('');
  },
}

var randWord = object.randomWord();

console.log(randWord);
console.log(object.wordSplit(randWord));

answered May 2, 2018 at 17:52

Oliver Baumann

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