lutils

LUtils

A few very robust utilities.

• merge Merges two objects together deeply
• merge.white Merge two objects together, but only properties that exist
• merge.black Merge two objects together, but only properties that do not exist
• typeOf Consistantly gets the type of a value as a string
• typeOf[type] Shortcut function which returns a bool
• clone Reliably deep clones an object or array, recursively

Include all or be selective.

{ clone, merge, typeOf } = require 'lutils'

typeOf = require 'lutils/typeOf'

clone( value, ?depth = 8?, ?types = [ 'object', 'array' ]? )

Clones an object or array as deep as depth.

Values which will still remain as references:

• Functions
• Object's __proto__ (such as class instances)
• Any property after depth is reached

To clone a function you should explicitly:

fn = oldFn.bind()
# or
fn = -> oldFn.apply this, arguments

merge fn, oldFn # Merge in any own properties of the function

merge( object1, object2, ?depth = 8?, ?types = [ 'object' ]? )

Merge the second object into the first recursively until depth is reached for each property, replacing object1's values with those in object2.

types is an array of types that, when matched on a value, will be iterated over and merged in. This means you can merge a function's properties or an array's properties recursively, thus preserving pointer references to the first object's instance.

fn1 = -> return 'fn1' + fn1.prop.b
fn1.prop = { a: 1 }

fn2 = -> return 'fn2' + fn2.prop.a
fn2.prop = { b: 2 }

obj1 = { a: { b: { fn: fn1 } } }
obj2 = { a: { b: { fn: fn2 } } }

merge obj1, obj2
# >> { a: { b: { fn: [Function] } } }

obj1.a.b.fn.prop
# >> { a: 1, b: 2 }

obj1.a.b.fn()
# 'fn1!2'

merge.white( object1, object2, depth = 8, iterators = [ 'object' ] )

Whitelisted merge. Merges properties into object1 from object only if the property exists in object1

merge.black( object1, object2, depth = 8, iterators = [ 'object' ] )

Blacklisted merge. Merges properties into object1 from object only if the property doesnt exist in object1

typeOf( value )

Returns the primitive type of a value as a lowercase string, very reliable. To be used in combination with instanceof and object.constructor.name when necessary.

typeOf 'a string' # >> 'object'
typeOf { an: { object: null } } # >> 'object'
typeOf null # >> 'null'
typeOf 0 # >> 'number'

Also has helper properties which return a boolean.

typeOftype

typeOf.RegExp 'not regex' # false
typeOf.Object null # false
typeOf.Array [] # true

###
Avaliable properties (Also avaliable in lowercase):
	typeOf.Undefined
	typeOf.Boolean
	typeOf.String
	typeOf.Function
	typeOf.Array
	typeOf.Object
	typeOf.Null
	typeOf.Number
	typeOf.Date
	typeOf.RegExp
	typeOf.NaN
###