# JOIN
Combines elements of an array into a single string with a specified separator.
## Syntax
```basic
result = JOIN(array, separator)
```
## Parameters
| Parameter | Type | Description |
|-----------|------|-------------|
| `array` | Array | The array of elements to join |
| `separator` | String | The delimiter to place between elements |
## Description
`JOIN` concatenates all elements of an array into a single string, inserting the specified separator between each element. This is commonly used for creating comma-separated lists, building display strings, or formatting data for output.
## Examples
### Basic Usage
```basic
names = ["Alice", "Bob", "Charlie"]
result = JOIN(names, ", ")
TALK result
' Output: "Alice, Bob, Charlie"
```
### Creating Hashtag Lists
```basic
tags = ["GeneralBots", "AI", "Automation", "NoCode"]
hashtags = JOIN(tags, " #")
hashtags = "#" + hashtags
TALK hashtags
' Output: "#GeneralBots #AI #Automation #NoCode"
```
### Building File Paths
```basic
parts = ["documents", "reports", "2025", "sales.pdf"]
path = JOIN(parts, "/")
TALK "File: " + path
' Output: "File: documents/reports/2025/sales.pdf"
```
### Email Recipients
```basic
recipients = ["john@example.com", "jane@example.com", "bob@example.com"]
to_list = JOIN(recipients, "; ")
SEND MAIL to_list, "Team Update", "Please review the attached report."
```
### Display Lists
```basic
items = FIND "products", "category=electronics"
product_names = []
FOR EACH item IN items
product_names = APPEND(product_names, item.name)
NEXT
TALK "Available products: " + JOIN(product_names, ", ")
```
## Return Value
Returns a string containing all array elements concatenated with the separator.
- If the array is empty, returns an empty string
- If the array has one element, returns that element as a string
- Null values in the array are converted to empty strings
## Sample Conversation
What hashtags should I use for my post about AI automation?
15:20
Here are some great hashtags for your AI automation post: