async-chainable-cartesian

Plugin for async-chainable to provide Cartesian iteration (all combinations of multiple arrays).

API

product([sets...], callback)

Execute a callback for all permutations of sets.

var asyncChainable = require('async-chainable');
var asyncChainableCartesian = require('async-chainable-cartesian');

var a = ['foo', 'bar', 'baz'];
var b = ['alpha', 'beta', 'gamma'];

asyncChainable()
	.use(asyncChainableCartesian)

	.product([a, b], function(next, value, index, max) {
		console.log('Product', index + '/' + max, '=', value);
		next();
	})

	.end();

See the test kit for more examples.

compare(set, callback)

Execute a callback for all permutations of items within one set. Unlike product() this function assumes that the result is symmetric - i.e. comparing set[0] to set[1] would return the same result as comparing set[1] to set[0]. This allows the function to optimize and make fewer loops than product() as the number of comparisons decreases for each item rather than remaining linear as with product().

asyncChainable()
	.use(asyncChainableCartesian)

	.set('set', ['foo', 'bar', 'baz'])
	.compare('set', function(next, value, index, max) {
		// Will output for values [foo,bar], [foo,baz], [bar,baz]
		console.log('Comparison', index + '/' + max, value[0], value[1]);
		next();
	})

	.end();

See the test kit for more examples.