runp

Run some functions in parallel.

Install

npm install runp

Usage

runp = require("runp");		// load the module

runp()						// create a runner object

.add(function(cb) {			// add a simple function that does something
	// do something.
	cb();	// call this when it's done
})

.add(function(cb, str) {	// pass in an argument and also return an error
	// str == "foo"
	cb("error "+str);
}, "foo")

.add(function(cb, str1, str2) {		// pass in multiple args
	// str1 == "bar", str2 = "baz"
	cb(null, "okay "+str1+" "+str2);
}, "bar", "baz")

.add( [ 7, 11 ], function( cb, num, str ) {		// call the func once for each item in an array
	// this function called twice once with num = 7 and once with num = 11
	// both times str = "qux"
	cb(null, "okay "+num+" "+str);
}, "qux")

// All the calls are set up but nothing happens until
// I call run() on the runner object, at which point all the functions
// will be fired off in parallel.  When they're all completed (okay or fail)
// the the call back calls you with an array of errors and results.

.run(function(errors, results) {
	// all the functions have completed
	// errors = [null, "error foo", null, null, null ];
	// results = [null, null, "okay bar baz", "okay 7 qux", "okay 11 qux" ];
})