I'm currently working on a helper method to identify the intersection of two hashes/Objects in this manner...
Object::intersect = (obj)->
t = {}
t[k] = @[k] for k of obj
t
x = { a: 1, b: 2, c: 3 }
w = { a: true, b: 3 }
x.intersect(w) #=> { a: 1, b: 2, intersect: [Function] }
The output is as expected aside from the unexpected addition of the 'intersect' key/value.
What could I be overlooking here?
Your property is enumerable, which is why it shows up in both objects during iteration.
One solution could be:
Object.defineProperty(Object.prototype, 'intersect', value:(obj)->
newObject = {}
newObject[key] = @[key] for key of obj
newObject
Check out a demonstration here (compiled as JS)
However, it's generally not recommended to modify objects you don't own, especially the Object. This can lead to unforeseen issues for other developers. Check out Maintainable JavaScript: Don’t modify objects you don’t own for more information.
In this case, it would be cleaner and simpler to just define a function that takes two objects as arguments...
After including the 'hasOwnProperty' verification, the intersect attribute is no longer present.
Object::intersect= (obj) ->
t = {}
t[k] = @[k] for own k of obj
t
coffee> x = {a:1, b:2, c:3}; w = {a:true, b:3}
{ a: true, b: 3 }
coffee> x.intersect(w)
{ a: 1, b: 2 }
If w contains keys that are not found in x, they will be shown in the output with a value of undefined.
A more robust function could be created using underscore
_ = require 'underline'
_.pick(x, _.keys(w))
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