Method●Since v1.0

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Convenience method for instantiating a RunnableBranch from RunnableLikes (objects, functions, or Runnables).

Each item in the input except for the last one should be a tuple with two items. The first is a "condition" RunnableLike that returns "true" if the second RunnableLike in the tuple should run.

The final item in the input should be a RunnableLike that acts as a default branch if no other branches match.

from<
  RunInput = any,
  RunOutput = any
>(
  branches: [...BranchLike<RunInput, RunOutput>[], RunnableLike<RunInput, RunOutput>]
): RunnableBranch<RunInput, RunOutput>

Parameters

Name	Type	Description
`branches`*	`[...BranchLike<RunInput, RunOutput>[], RunnableLike<RunInput, RunOutput>]`	An array where the every item except the last is a tuple of [condition, runnable] pairs. The last item is a default runnable which is invoked if no other condition matches.

Example

import { RunnableBranch } from "@langchain/core/runnables";

const branch = RunnableBranch.from([
  [(x: number) => x > 0, (x: number) => x + 1],
  [(x: number) => x < 0, (x: number) => x - 1],
  (x: number) => x
]);

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