\  / _. |  _  ._ _|_ o ._   _
 \/ (_| | (/_ | | |_ | | | (/_

JavaScript's Sister, and protector — inspired by Underscore; Valentine provides you with type checking, functional iterators, and common utility helpers such as waterfalls, queues, and parallels; all utilizing native JavaScript methods (when available) for optimal speed.

Browser usage:

<script src="valentine.js"></script>
<script>
  v.forEach(['a', 'b', 'c'], function (letter) {

  })
</script>

Node users, install it:

$ npm install valentine

Use it:

var v = require('valentine')

// showcase object style
v(['a', 'b', 'c']).map(function (letter) {
  return letter.toUpperCase()
}).join(' '); // => 'A B C'

API

iterators

• v.each(ar || obj, callback[, scope])
• v.map(ar || obj, callback[, scope])
• v.every(ar, callback[, scope])
• v.some(ar, callback[, scope])
• v.filter(ar, callback[, scope])
• v.reject(ar, callback[, scope])
• v.indexOf(ar, item[, start])
• v.lastIndexOf(ar, item[, start])
• v.reduce(ar, callback, memo[, scope])
• v.reduceRight(ar, callback, memo[, scope])

utility

• v.extend(obj[, obj2[, obj3[...]]])
• v.merge(ar1, ar2)
• v.pluck(ar, key)
• v.toArray(sparse)
• v.size(ar)
• v.find(ar, key)
• v.compact(ar)
• v.flatten(ar)
• v.uniq(ar)
• v.first(ar)
• v.last(ar)
• v.keys(obj)
• v.values(obj)
• v.trim(str)
• v.bind(scope, fn, [curried args])
• v.curry(fn, [curried args])
• v.inArray(ar, needle)
• v.parallel([fn args])

v.parallel(
  function (fn) {
    getTimeline(function (e, timeline) {
      fn(e, timeline)
    })
  }
, function (fn) {
    getUser(function (e, user) {
      fn(e, user)
    })
  }
, function (e, timeline, user) {
    if (e) return console.log(e)
    ok(timeline == 'one', 'first result is "one"')
    ok(user == 'two', 'second result is "two"')
  }
)

• v.waterfall([fn args])

v.waterfall(
  function (callback) {
    callback(null, 'one', 'two')
  }
, function (a, b, callback) {
    console.log(a == 'one')
    console.log(b == 'two')
    callback(null, 'three')
  }
, function (c, callback) {
    console.log(c == 'three')
    callback(null, 'final result')
  }
, function (err, result) {
    console.log(!!err == false)
    console.log(result == 'final result')
  }
)

• v.waterfall([fn1, fn2<, fn3>], callback)
• v.queue([fn args])

var it = v.queue(
  function () {
    console.log('one')
    it.next()
  }
, function () {
    console.log('two')
    it.next()
  }
, function () {
    console.log('three')
  }
)
it.next()

type checking

• v.is.fun(o)
• v.is.str(o)
• v.is.ele(o)
• v.is.arr(o)
• v.is.arrLike(o)
• v.is.num(o)
• v.is.bool(o)
• v.is.args(o)
• v.is.emp(o)
• v.is.dat(o)
• v.is.nan(o)
• v.is.nil(o)
• v.is.und(o)
• v.is.obj(o)

Object Style

v(['a', 'b', 'c']).map(function (letter) {
  return letter.toUpperCase()
}); // => ['A', 'B', 'C']

Chains

v(['a', 'b', [['c']], 0, false,,,null,['a', 'b', 'c']])
  .chain().flatten().compact().uniq().map(function (letter) {
    return letter.toUpperCase()
  }).value(); // => ['A', 'B', 'C']

Ender Support

Don't have Ender? Install it, and don't ever look back.

$ [sudo] npm install ender -g

Then build valentine into your package

$ ender build valentine

Have an existing Ender package? Include it:

$ ender add valentine

Write code like a boss

// as a top level method
$.v(['a', ['virus'], 'b', 'c']).reject(function (el, i) {
  return $.is.arr(el[i])
})

// top level methods in bridge
$.each
  map
  merge
  extend
  toArray
  keys
  values
  trim
  bind
  curry
  parallel
  waterfall
  inArray
  queue

Or just require the valentine module

!function (v) {
  v(['a', ['virus'], 'b', 'c']).reject(function (el, i) {
    return v.is.arr(el[i])
  })
}(require('valentine'))

Developers

Care to contribute? Make your edits to src/valentine.js and get your environment up and running

$ npm install -d
$ make
$ make test
$ open tests/index.html

Happy iterating!