---
title: Set variable
icon: pen
---
The "Set variable" block allows you to set a particular value to a variable.
## Custom
You can set your variable with any value with `Custom`. It can be any kind of plain text but also **Javascript code**.
### Expressions with existing variables
It means you can apply operations on existing variables.
Add a value to your variable:
```
{{Score}} + 5
```
Compute a sum of variables:
```
{{Score}} + {{Answer}}
```
Multiply variables together:
```
{{Score}} * {{Multiplier}}
```
Compute a percentage:
```
{{Score}} * 100 / {{Max Score}}
```
Extract the first name from a full name:
```
{{Full name}}.split(' ')[0]
```
Transform existing variable to upper case or lower case:
```
{{Name}}.toUpperCase()
```
```
{{Name}}.toLowerCase()
```
This can also be Javascript code. It will read the returned value of the code and set it to your variable.
```js
const name = 'John' + 'Smith'
return name
```
If you don't provide the `return` keyword then it will be automatically prepended to the beginning of your code.
```js
'John' + 'Smith'
```
is the same as
```js
return 'John' + 'Smith'
```
Variables in script are not parsed, they are evaluated. So it should be treated as if it were real Javascript variables.
So, if you write `"{{My variable}}"`, it will parse the variable ID (something like `vclfqgqkdf000008mh3r6xakty`). You need to remove the double quotes to properly get the variable content value.
For example,
- ❌ `"{{URL base}}/path"` => `vclfqgqkdf000008mh3r6xakty/path`
- ✅ `{{URL base}} + '/path'` => `https://domain.com/path`
- ✅ `` `${{{URL base}}}/path` `` => `https://domain.com/path`
## Moment of the day
It will set your variable with either one of these values based on the user's time of the day: `morning`, `afternoon`, `evening`, `night`.
Then you can use this variable to conditionally display content:
## Map item with same index
This is a convenient value block that allows you to easily get an item from a list that has the same index as an item from another list.
When you are pulling data from another service, sometimes, you will have 2 lists: `Labels` and `Ids`. Labels are the data displayed to the user and Ids are the data used for other requests to that external service.
This value block allows you to find the `Id` from `Ids` with the same index as `Label` in `Labels`
