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{{alias}}( fcns, clbk[, thisArg] )
Executes functions in series, passing the results of one function as
arguments to the next function.
The last argument applied to each waterfall function is a callback. The
callback should be invoked upon a series function completion. The first
argument is reserved as an error argument (which can be `null`). Any results
which should be passed to the next function in the series should be provided
beginning with the second argument.
If any function calls the provided callback with a truthy `error` argument,
the waterfall suspends execution and immediately calls the completion
callback for subsequent error handling.
Execution is *not* guaranteed to be asynchronous. To ensure asynchrony, wrap
the completion callback in a function which either executes at the end of
the current stack (e.g., `nextTick`) or during a subsequent turn of the
event loop (e.g., `setImmediate`, `setTimeout`).
Parameters
----------
fcns: Array<Function>
Array of functions.
clbk: Function
Callback to invoke upon completion.
thisArg: any (optional)
Function context.
Examples
--------
> function foo( next ) { next( null, 'beep' ); };
> function bar( str, next ) { console.log( str ); next(); };
> function done( error ) { if ( error ) { throw error; } };
> var fcns = [ foo, bar ];
> {{alias}}( fcns, done );
{{alias}}.factory( fcns, clbk[, thisArg] )
Returns a reusable waterfall function.
Parameters
----------
fcns: Array<Function>
Array of functions.
clbk: Function
Callback to invoke upon completion.
thisArg: any (optional)
Function context.
Returns
-------
fcn: Function
Waterfall function.
Examples
--------
> function foo( next ) { next( null, 'beep' ); };
> function bar( str, next ) { console.log( str ); next(); };
> function done( error ) { if ( error ) { throw error; } };
> var fcns = [ foo, bar ];
> var waterfall = {{alias}}.factory( fcns, done );
> waterfall();
> waterfall();
> waterfall();
See Also
--------
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