Index Block

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Overview

The Index Block allows you to retrieve values from an array at specified indices. It can return a single value when given a single index or multiple values when provided with an array of indices. This block is particularly useful for extracting specific elements from arrays or for reordering array elements based on a set of indices.

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Key Features

• Retrieve a single value at a specified index
• Extract multiple values using an array of indices
• Supports negative indices for accessing elements from the end of the array
• Option to invert the selection to get all values except those at specified indices

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Inputs

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Outputs

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Editor Settings

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Example: Extracting Specific Elements from an Array

1. Create an Array Block with values [10, 20, 30, 40, 50].
2. Add an Index Block and connect the Array Block to its array input.
3. Create a Number Block with value 2 (or an Array Block with values [0, 2, 4]) and connect it to the Index Block’s indicies input.
4. Run the flow. The Index Block’s output will be 30 (or [10, 30, 50] if using an array of indices).

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Error Handling

• If an index is out of range (less than 0 or greater than array length), the block will throw an error
• If the array input is not an array, the block will throw an error
• If no values are selected, the output will be control-flow-excluded

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FAQ

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See Also

• Array Block
• Filter Block
• Map Block