reduce.md

.reduce(fn[, initialValue]) => Any

Applies the provided reducing function to every node in the wrapper to reduce to a single value. Each node is passed in as a ReactWrapper, and is processed from left to right.

Arguments

1. fn (Function): A reducing function to be run for every node in the collection, with the following arguments:

• value (T): The value returned by the previous invocation of this function
• node (ReactWrapper): A wrapper around the current node being processed
• index (Number): The index of the current node being processed

2. initialValue (T [optional]): If provided, this will be passed in as the first argument to the first invocation of the reducing function.

Returns

T: Returns an array of the returned values from the mapping function...

Example

function Foo() {
  return (
    <div>
      <Bar amount={2} />
      <Bar amount={4} />
      <Bar amount={8} />
    </div>
  );
}

const wrapper = mount(<Foo />);
const total = wrapper.find(Bar).reduce((amount, n) => amount + n.prop('amount'));
expect(total).to.equal(16);

Related Methods

• .reduceRight(fn[, initialValue]) => Any
• .forEach(fn) => ReactWrapper
• .map(fn) => Array<Any>