Permutron

Asynchronously iterate permutations of function arguments

Synopsis

var permutron = require('permutron');

permutron('static', ['permutable'], 'static', generator, ['permutable'], function (a, b, c, d, next) { }, done);

function generator(n, context, next) {
    next(null, {value: n, done: n > 1});
};

permutron.raw(['static', ['permutable'], 'static', ['permutable']], function(row, next) { }, done);

permutron.object({static: "static", permute: ['permutable']}, function (obj, next) { }, done);

Description

Permutron simply iterates over each argument, giving one permutation each time.

Arguments that are arrays are used as sources of permutations, other arguments are passed along statically.

Example

var permutron = require('permutron');

permutron('static1', ['dynamic1', 'dynamic2'], ['dynamic3', 'dynamic4'], generator, 'static2', function (a, b, c, d, e, next) {
    console.log(a, b, c, d, e);
    next();
}, function (err) {
    console.log('done!');
});

function generator(n, context, next) {
    next(null, {value: n, done: n > 1});
};

Will output:

static1 dynamic1 dynamic3 0 static2
static1 dynamic1 dynamic4 1 static2
static1 dynamic1 dynamic3 0 static2
static1 dynamic1 dynamic4 1 static2
static1 dynamic2 dynamic3 0 static2
static1 dynamic2 dynamic4 1 static2
static1 dynamic2 dynamic3 0 static2
static1 dynamic2 dynamic4 1 static2
done!