Enumerable

Enumerable mixin.

TODO... finish me

users
  .map('friends')
  .select(function(u){ return u.age > 20 })
  .map('name.first')
  .grep(/^T/)

Installation

$ component install component/enumerable

API

mixin()

Mixin to obj.

 var Enumerable = require('enumerable');
 Enumerable(Something.Enumerabletype);

Enumerable#each(fn:Function)

Iterate each value and invoke fn(val, i).

 users.each(function(val, i){
   
 })

Enumerable#map(fn:Function)

Map each return value from fn(val, i).

Passing a callback function:

 users.map(function(user){
   return user.name.first
 })

Passing a property string:

 users.map('name.first')

Enumerable#select(fn:Function)

Select all values that return a truthy value of fn(val, i).

 users.select(function(user){
   return user.age > 20
 })

Enumerable#reject(fn:Function)

Reject all values that return a truthy value of fn(val, i).

Rejecting using a callback:

 users.reject(function(user){
   return user.age < 20
 })

Rejecting values via ==:

 data.reject(null)
 users.reject(tobi)

Enumerable#compact()

Reject null and undefined.

 [1, null, 5, undefined].compact()
 // => [1,5]

Enumerable#find(fn:Function)

Return the first value when fn(val, i) is truthy, otherwise return undefined.

 users.find(function(user){
   return user.role == 'admin'
 })

Enumerable#findLast(fn:Function)

Return the last value when fn(val, i) is truthy, otherwise return undefined.

 users.findLast(function(user){
   return user.role == 'admin'
 })

Enumerable#any(fn:Function)

Assert that at least one invocation of fn(val, i) is truthy.

For example checking to see if any pets are ferrets

 pets.any(function(pet){
   return pet.species == 'ferret'
 })

Enumerable#count(fn:Function)

Count the number of times fn(val, i) returns true.

 var n = pets.count(function(pet){
   return pet.species == 'ferret'
 })

Enumerable#indexOf(obj:Mixed)

Determine the indexof obj or return -1.

Enumerable#grep(re:RegExp)

Grep values using the given re.

 users.map('name').grep(/^tobi/i)

Enumerable#reduce(fn:Function, [val]:Mixed)

Reduce with fn(accumulator, val, i) using optional init value defaulting to the first enumerable value.

Enumerable#max(fn:Function|String)

Determine the max value.

With a callback function:

 pets.max(function(pet){
   return pet.age
 })

With property strings:

 pets.max('age')

With immediate values::

 nums.max()

Enumerable#sum(fn:Function|String)

Determine the sum.

With a callback function:

 pets.sum(function(pet){
   return pet.age
 })

With property strings:

 pets.sum('age')

With immediate values:

 nums.sum()

Enumerable#first([n]:Number|Function)

Return the first value, or first n values.

Enumerable#last([n]:Number|Function)

Return the last value, or last n values.

Enumerable#inGroupsOf(n:Number)

Return values in groups of n.

Enumerable#at(i:Number)

Return the value at the given index.

Enumerable#value()

Return the enumerable value.

License

MIT