Set List Value

Replaces an existing 1-based element with a compatible value. It is not an automatic append past the end.

Where to find it

Set Variable → Operations → Choose Operation → List. Requires Dev access to configure, then a successful compile to activate.

Inputs

Input	Type	Role	Requirement	Default / constraint
List	List	Variable binding	Required	Required
Index (starts at 1)	Number	Value	Required	Required
Value	Compatible declared type	Value	Required	Required

Result and behavior

Stores the result in the first configured destination Variable. Its type must match the result and any generic element/key types.

Configuration example

Block: Set Variable → Operations
Operation: Set List Value
List: Private List<T> result
Index (starts at 1): 1
Value: Number 1 (match the destination/element type)

Use this as an editor configuration: declare any Variables/collections first and choose real locations/eligible targets for your plot. It is not pasteable source code.

Restrictions and troubleshooting

Initialize the collection first. Element/key/value declarations are invariant. Reference inputs share mutable contents; choose a copy mode when isolation is required. List indices begin at 1; unsuccessful index searches return 0.

Related guides

Editor · Arguments · Targets · Expressions · Native behavior

Reference identifier: list.set.