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 ShallowWrapper, 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 (ShallowWrapper): 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

class Foo extends React.Component {
  render() {
    return (
      <div>
        <Bar amount={2} />
        <Bar amount={4} />
        <Bar amount={8} />
      </div>
    );
  }
}

const wrapper = shallow(<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) => ShallowWrapper
• .map(fn) => Array<Any>