doUntil.js

import doWhilst from './doWhilst';

/**
 * Like ['doWhilst']{@link module:ControlFlow.doWhilst}, except the `test` is inverted. Note the
 * argument ordering differs from `until`.
 *
 * @name doUntil
 * @static
 * @memberOf module:ControlFlow
 * @method
 * @see [async.doWhilst]{@link module:ControlFlow.doWhilst}
 * @category Control Flow
 * @param {Function} fn - A function which is called each time `test` fails.
 * 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 the non-error callback results of `fn`.
 * @param {Function} [callback] - A callback which is called after the test
 * function has passed 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 doUntil(fn, test, callback) {
    doWhilst(fn, function() {
        return !test.apply(this, arguments);
    }, callback);
}