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import whilst from './whilst';
/**
* The post-check version of [`whilst`]{@link module:ControlFlow.whilst}. To reflect the difference in
* the order of operations, the arguments `test` and `fn` are switched.
*
* `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
*
* @name doWhilst
* @static
* @memberOf module:ControlFlow
* @method
* @see [async.whilst]{@link module:ControlFlow.whilst}
* @category Control Flow
* @param {Function} fn - A function which is called each time `test` passes.
* The function is passed a `callback(err)`, which must be called once it has
* completed with an optional `err` argument. Invoked with (callback).
* @param {Function} test - synchronous truth test to perform after each
* execution of `fn`. Invoked with Invoked with the non-error callback results
* of `fn`.
* @param {Function} [callback] - A callback which is called after the test
* function has failed and repeated execution of `fn` has stopped. `callback`
* will be passed an error and any arguments passed to the final `fn`'s
* callback. Invoked with (err, [results]);
*/
export default function doWhilst(fn, test, callback) {
var calls = 0;
whilst(function() {
return ++calls <= 1 || test.apply(this, arguments);
}, fn, callback);
}
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