Reduce¶
| Name | Mandatory | Description | Default | Type |
|---|---|---|---|---|
⬅️ Input |
The sequence to reduce. | [Any] |
||
Output ➡️ |
The resulting value after applying the operation to each item of the sequence. | Any |
||
Apply |
No | The function to apply to each item of the sequence. | none |
Shard[Shard] |
Reduces a sequence to a single value by applying an operation (specified in the Apply parameter) to each item of the sequence. Note that this shard is able to use the $0 internal variable for the current item and $i for the current index.
Details¶
This shard is able to use a special temporary variable $0 which acts as an Accumulator which will hold the intermediate result during the reduction process.
For example consider the following: [1 2 3 4 5] | Reduce(Math.Subtract($0))
This shard will be processed as follows:
- Each element of the sequence will be passed as input to Math.Subtract and the Accumulator($0) will be subtracted from it.
- The result will then be set as the new value of the Accumulator($0).
- First, $0 is initialized with the first element of the sequence: $0 = 1
- 2 - 1 = 1 ($0 then becomes 1)
- 3 - 1 = 2 ($0 then becomes 2)
- 4 - 2 = 2 ($0 then becomes 2)
- 5 - 2 = 3 ($0 then becomes 3)
- The final value of $0 is then returned.
Do note that this instance of $0 is unique to the Reduce shard and do not exist outside of the context of its Apply parameter. Values set to this instance of $0 will not be reflected on other $0 created in a different call of another Reduce shard or any other shard that is also able to use $0.