### Set Block

The second line starts with the function `setBlock`. You can imagine this as placing a script block with the aforementioned name. A list of these functions can be found in the [examples](fancade-web#editor-scripting). The following text represents the inputs given to this function, separated by `,` and enclosed by brackets. So to put this in [[visual scripting]] therms, we are placing a block called `setBlock` and give it the inputs `x`, `y`, `z` and `prefabIndex`.

But those inputs were actually just placeholders, so let's replace them with some actual values!

```

Copy this code and paste it in the editor, then hit `Run` and `Save and Close`. As you might have guessed, this puts a block on the coordinates `0, 0, 0`. The fourth value is the unique identifier for the Grass block to be placed. There is a list of unique ids for each built-in block, but what if we want to place a custom block instead?

### Find Block

[Create a custom block](/wiki/build/how-do-i-make-my-own-custom-blocks), for instance `My Block`. Then replace your previous code with this one:

```js

// Find the block called "My Block"

findBlock("My Block");

## Variables

```js

// Find block by name and store it in a variable

let myBlock = findBlock("My Block");

setBlock(0, 0, 0, myBlock);

This line is different, because it doesn't start with the name of a function. Instead, we can see the `let` instruction, which tells JavaScript to create a new variable for us. The name of the variable is determined by the next word, `myBlock`. To store a value in the new variable, we follow the variable name with a `=` and the value to store, similar to a [[Set Variable]] block. In this case, this value is the output of the function we have used before.\\

The next line looks familiar and it once again places a block at the coordinates `0, 0, 0`. But this time we don't directly input the id of our block, but instead we use the value stored in the variable which we have created before. This allows us to not only store the id of our block, but also use it in multiple other places.\\

After we have created the variable, we can change its value by adding following code in order to add a Brick next to our previous block:

```js

// Change the value of the variable

myBlock = findBlock("Brick");

setBlock(1, 0, 0, myBlock);

```

But what if we want to store multiple blocks in our variable?

## Arrays

```js

let myBlocks = [];

myBlocks[0] = findBlock("Bricks");

myBlocks[1] = findBlock("Dirt");

```

Like previously, we are creating a new variable. But this time, we instead store an empty list `[]` in it. We then add values to the list by assigning them to the indexes in curly braces. This works similar to a [[ List Element ]] block and is also used to access the values afterwards.

```js

setBlock(0, 0, 1, myBlocks[0]);

setBlock(1, 0, 1, myBlocks[0]);

## Objects

```js

let blockIds = {}

myBlocks["Stone"] = findBlock("Stone");

myBlocks["Slate"] = findBlock("Slate");

Objects `{}` are similar to lists in that they can hold values for different indexes. However, they access their values using a string as index. For instance, this allows you to store blocks based on their name instead of their id.

```

<!-- ToDo: Loops, Conditions -->