Question

I have an array of elements that I would like to apply a mapping to to convert it into key value pairs on a single object (to mimic an associative array).

The approach in Can destructuring assignment be used to effect a projection in CoffeeScript? does not seem to work for me as it results in a simple array instead of key/value pairs.

My language of choice is CoffeeScript or JavaScript.

An example:

[{name: 'a', value: 'b', other: 'c'}, {name: 'd', value: 'e', other: 'f'}]

is supposed to be transformed into:

{
  a: 'b',
  d: 'e'
}

One-liners are preferred. 😉

Answer 1

To fix the syntax error, you’ll have to expand { @name: @value } to:

o = {}; o[@name] = @value; o

You can then merge the objects with $.extend() and a splat (with the empty object to avoid accidentally extending jQuery):

$.extend {}, $(row).children('input').map(() -> o = {}; o[@name] = @value; o)...

Though, a simpler option would be just to use a 2-liner:

result = {}
$(row).children('input').each(() -> result[@name] = @value)