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What is ReflectAll(tasks) in Async?

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Async is a utility module that provides powerful, straight-forward functions for working with asynchronous JavaScript.

Async reflectAll

Async reflectAll is a helper function that wraps an array or an object of functions with async reflect. It returns a type array of async functions that are each wrapped in async.reflect. Reflect is useful as it wraps any async function in another function and always results a return object. If there is an error, the result object will return a NULL value.

Key features

  1. It is a static method.
  2. It is a member of module:utils.
  3. The parameters are collections of async functions of type Array|Object|Iterable tasks.
  4. It returns an array of async functions that are each wrapped in async.reflect.

Sample Code

The default code for this method is reflectAll:

export default function
// tasks is the parameters
reflectAll(tasks) {
    var results;
// if it's an array, simply perform reflect on the whole array
    if (Array.isArray(tasks)) {
        results = tasks.map(reflect);
    } else {
// otherwise, call reflect individually on each task and store it in an array
        results = {};
        Object.keys(tasks).forEach(key => {
            results[key] = reflect.call(this, tasks[key]);
        });
    }
    return results;
}

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RELATED TAGS

async.reflect
async reflectall
reflectall
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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