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import initialParams from './internal/initialParams';
import rest from 'lodash/rest';
/**
* Wraps the function in another function that always returns data even when it
* errors.
*
* The object returned has either the property `error` or `value`.
*
* @name reflect
* @static
* @memberOf module:Utils
* @method
* @category Util
* @param {Function} fn - The function you want to wrap
* @returns {Function} - A function that always passes null to it's callback as
* the error. The second argument to the callback will be an `object` with
* either an `error` or a `value` property.
* @example
*
* async.parallel([
* async.reflect(function(callback) {
* // do some stuff ...
* callback(null, 'one');
* }),
* async.reflect(function(callback) {
* // do some more stuff but error ...
* callback('bad stuff happened');
* }),
* async.reflect(function(callback) {
* // do some more stuff ...
* callback(null, 'two');
* })
* ],
* // optional callback
* function(err, results) {
* // values
* // results[0].value = 'one'
* // results[1].error = 'bad stuff happened'
* // results[2].value = 'two'
* });
*/
export default function reflect(fn) {
return initialParams(function reflectOn(args, reflectCallback) {
args.push(rest(function callback(err, cbArgs) {
if (err) {
reflectCallback(null, {
error: err
});
} else {
var value = null;
if (cbArgs.length === 1) {
value = cbArgs[0];
} else if (cbArgs.length > 1) {
value = cbArgs;
}
reflectCallback(null, {
value: value
});
}
}));
return fn.apply(this, args);
});
}
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