if-else.mdx

import { Screenshot } from 'components/screenshot'; import Image from 'next/image'; import { Callout } from 'nextra/components'; import { Steps } from 'nextra/components'; import branch1 from '/public/nodes/branch1.png'; import branch2 from '/public/nodes/branch2.png'; import branch3 from '/public/nodes/branch3.png';

Branch (If Else)

The Branch node is a conditional node in your workflow, designed to execute different sets of actions based on a specific condition. This node provides a powerful way to control the flow of your workflow, making it flexible and dynamic.

Using the Branch node

The Branch node evaluates a base condition. If the condition evaluates to "true", the node executes the actions in the "Then" block. If the condition evaluates to "false", it proceeds to execute the actions in the "Else" block.

Supported Comparison Operators

To define your conditions, the "Branch" node supports the following comparison operators:

• ==: Checks whether two values are equal
• !=: Checks whether two values are not equal.
• >: Checks whether the first value is greater than the second value.
• <: Checks whether the first value is less than the second value.
• >=: Checks whether the first value is greater than or equal to the second value.
• <=: Checks whether the first value is less than or equal to the second value.

**These comparison operators also work on strings**. You can use them to compare string values and make decisions based on string conditions.

With these operators, you can construct various conditions to control the flow of your workflow based on specific data or inputs.

Example: Conditional Response Based on Request Body

In this example, we'll create a workflow that receives an HTTP request with a JSON body. The workflow will check the value of the number key in the request body. If the value is greater than 10, the workflow will return a message saying that the number is greater than 10. If the value is less than or equal to 10, the workflow will return a message saying that the number is less than or equal to 10.

### HTTP Trigger Node Create a workflow with an HTTP Request Trigger to receive incoming requests.

### Add Branch Node
Add a Branch (If Else) node to the workflow.

### Set Branch Condition
Click on the **Expression Menu**, select **Expression Editor**. Set the Branch node's condition as:
```js copy
ctx["request"]["body"]["number"] > 10
```

### Setting Then and Else conditions
- In the "**Then**" block of the Branch node, add a **Return** node with the message:
```js copy
ctx["request"]["body"]["number"] + " is greater than 10".
```
- In the "**Else**" block of the Branch node, add another **Return** node with the message:
```js copy
ctx["request"]["body"]["number"] + " is less than 10".
```

### Test the Workflow
Click deploy and send a request to the given endpoint with a JSON body containing the `number` key. Here's an example body JSON:

```json
{
    "number": 15
}
```

Execution of the Example

• If the incoming requests' number key has a value greater than 10 (e.g., "number": 15), the workflow returns 15 is greater than 10.

• If the incoming requests' number key has a value less than or equal to 10 (e.g., "number": 5), the workflow returns 5 is less than or equal to 10.

Nested Branch (Nested If Else)

A Nested Branch or a Nested If Else is a conditional structure within another conditional structure. Using nested branches allows you to create more complex conditional logic in your workflow by combining multiple levels of "if-else" statements. This approach is useful when you need to evaluate multiple conditions sequentially, with each condition leading to a different set of actions.

Nested Branch Example

Let's consider a scenario where we want to categorize incoming numbers into three groups: "Greater than 20," "Between 10 and 20," and "Less than or equal to 10."

### HTTP Trigger Node Create a workflow with an HTTP Request Trigger to receive incoming requests.

### Add Branch Node
Add a Branch (If Else) node to the workflow.

### Set Branch Condition
Click on the **Expression Menu**, select **Expression Editor**. Set the Branch node's condition as:
```js copy
ctx["request"]["body"]["number"] < 20
```
### Adding Nested conditions
- In the "**Then**" block of the first Branch node, add another Branch (If Else) node.
- Set the condition in the second Branch node as
```js copy
ctx["request"]["body"]["number"] > 10
```
- In the "**Then**" block of the second Branch node, add a Return node with the expression:
```js copy
ctx["request"]["body"]["number"] + " is between 10 and 20"
```
- In the "**Else**" block of the second Branch node, add another Return node with the message:
```js copy
ctx["request"]["body"]["number"] + " is less than or equal to 10"
```
- In the "**Else**" block of the first Branch node (i.e., if the number is not greater than 20), add a Return node with the message:
```js copy
ctx["request"]["body"]["number"] + " is greater than 20"
```

### Test the Workflow
Click deploy and send a request to the given endpoint with a JSON body containing the `number` key. Here's an example body JSON:

```json
{
    "number": 15
}
```