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# Question about the Splice() method

Is it possible to pass "random" as the first argument to the splice method?

I would like to insert an item to a random location in the array.

Splice(random, 1, "O")

Possible?

PLUS

Yeah, i think that's possible what you want. I would do it this way:

var random = Math.floor(Math.random() * NUMBER); //It's depends on in what range you want a random number array.splice(random, 0, "0");

If you want to range the whole array, that line should do it: var random = Math.floor(Math.random() * array.length);

I rushed my answer. I know what you mean, and makes alot of sense now. Thank you for your answer!!

Koszonom Balazs!

```var grid = document.getElementById('grid');
var random = Math.floor(Math.random() * Array.length);
var arr = Array(620).fill('O');
arr.splice(random, 1, "C");

grid.textContent = arr.join('');
```

It keeps putting the C at index zero. Not the random location we created with that var random. Not sure whats wrong.

At first, with Array with capital A, you referencing to the Array global object, it's a reserved word in javascript. At my code switch the 'array' name to your array's variable name.

Gotcha. I actually just added a numeric value as the length (+1 of course).

In fact, since than i figured out my whole program. I got the loop going as well in every 3 seconds, it places the C to another location. Now that i got the basic principals down, i will dress it up and add more cool functionality. Im excited, i just created my first program! And largely thanks to your idea with the random. Im gonna paste the code for the program. Its based on the "find the C under one minute" eye test. But just to mess with people, i jump the C around.

```<!DOCTYPE HTML>
<html lang="en">
<meta charset="utf-8">
<button onclick="setInterval(myFunction, 3000);">Find the "C"!!</button>
<body id="parent">
<div id="grid">

</div>
<script src="script.js"></script>
</body>
</html>
```
```* {
box-sizing: border-box;
}

#parent {
display: flex;
justify-content: center;
align-items: center;
background: lightgray;
}

#grid {
background: black;
color: white;
width: 360px;
height: 360px;
resize: both;
word-break: break-all;
}
```
```var grid = document.getElementById('grid');

function myFunction() {
var arr = Array(620).fill('O');
var random = Math.floor(Math.random() * 621);
arr.splice(random, 1, "C");
grid.textContent = arr.join('');
};
```

Congrats for you first program, good idea! :) Yeah, at first what matters is that it's working. Btw with Array(620).fill('O'); it's creates 620 items in the array, with index from 0 to 619, so 620 at the random number generator should be good. In your case arr.length would work there.