Get List Index of Value

Searches for a value and returns its 1-based index. Returns 0 when not found. Check this sentinel before using the result as an index.

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
Result	Number	Variable binding	Required	Required
Source List	List	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: Get List Index of Value
Result: Private Number result
Source List: a declared List containing two compatible elements
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.index.