reduce

Returns an aggregated value derived from applying the function parameter successively to each value in array in combination with the result of the previous application of the function.

Type: transform

Aliases

arrayReduce, reduce

Parameters

• input (array): The input array to reduce.
• expression (string): The JEXL expression to apply for each reduction step.
• initialValue (unknown): The initial value for the accumulator.

Returns

Type: unknown

The final accumulated value, or undefined if input is not an array.

Examples

reduce([1, 2, 3, 4], "accumulator + value", 0) // 10

[1, 2, 3]|reduce("accumulator * value", 1) // 6

reduce(["a", "b", "c"], "accumulator + value", "") // "abc"