lib/until.js


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import whilst from './whilst';

/**
 * Repeatedly call `fn` until `test` returns `true`. Calls `callback` when
 * stopped, or an error occurs. `callback` will be passed an error and any
 * arguments passed to the final `fn`'s callback.
 *
 * The inverse of {@link async.whilst}.
 *
 * @name until
 * @static
 * @memberOf module:async
 * @method
 * @see [async.whilst]{@link module:async.whilst}
 * @category Control Flow
 * @param {Function} test - synchronous truth test to perform before each
 * execution of `fn`. Invoked with ().
 * @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} [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 until(test, fn, callback) {
    whilst(function() {
        return !test.apply(this, arguments);
    }, fn, callback);
}