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Loop Node

Run a sub-workflow multiple times. This node provides a way to iterate and sequentially run a sub-workflow consisting of 1 or more nodes. First node of the sub-workflow must be connected to the Start handle of the loop node. Last node of the sub-workflow must be connected to the End handle of the loop node.

Output of the Loop node is concatenated output of all iterations of the sub-workflow.

Parameters​

initialization​

The code to execute before the first iteration of the sub-workflow.

condition​

Expression to evaluate before each iteration of the sub-workflow. If the expression evaluates to `true`, the sub-workflow will be run. If the expression evaluates to `false`, the loop will end.

update​

This expression is evaluated to update the variables defined in `initialization`.

Examples​

Basic Loop with fixed number of iterations​

Initialization​

{
  i: 0;
}

Condition​

i < 10;

Update​

{
  i: i + 1;
}

Loop until a condition is met​

This pattern is useful when you don't know the number of iterations in advance. For example, when retrieving items from a paginated data source.

Initialization​

{
  shouldContinue: true;
}

This condition makes sure loop runs at least once.

Condition​

shouldContinue;

Update​

{
  shouldContinue: output.shouldContinue;
}

Update the `shouldContinue` variable with the output of the sub-workflow. Output of the sub-workflow is output data from node connected to the End handle of the loop node.