Subtract Variable

Subtract Variable node is designed to perform subtraction operations on a specified variable and store the result back in the same variable. This node is useful for decreasing values or calculating differences within your workflow.

Properties Panel

Field	Description	Required
Node name	Node Name	true
Variable Name	The name of the variable from which the value will be subtracted.	true
Value	The value to subtract from the variable.	true

Usage

1. Specify the name of the variable from which you want to subtract.

2. Enter the subtrahend (the value to be subtracted from the variable).

Behaviour

• The node will retrieve the current value of the specified variable.

• It will then subtract the provided value from this variable.

• The result of the subtraction will be stored back in the same variable, overwriting its previous value.

• If the variable doesn't exist, it'll raise an error.

Returns

The node updates the value of the specified variable with the result of the subtraction. You can access this updated value using Magical Autocomplete (e.g., $.variables.<variable_name>) in any node below this node.

Example

Let's say you want to apply a $5 discount to a price. You already have a variable price:

1. Set Variable name to $.variables.price

2. Set Value to 5

If it exists and price was 20, it will now be 15.

Best Practices

• Ensure that the variable you're subtracting from contains a numeric value to avoid type conversion errors.

• Be aware of the order of subtraction. This node subtracts the provided value from the variable, not the other way around.

• Ensure that the variable is initialized earlier