Question

For example, given the following structure

    pages = [
        [
            { myvar: 1},
            { myvar: 2},
            { myvar: 3},
        ]
    ];

How can I express the folling (python-like) comprehension?

v.myvar for p in pages for v in p

Answer 1

AFAIK, you can not, see: https://github.com/jashkenas/coffee-script/issues/1191

A workaround in the meantime (until CoffeeScript gets improved):

pages = [
        [
            { myvar: 1},
            { myvar: 2},
            { myvar: 3},
        ]
    ];

result = []
for row in pages
  for map in row
    result.push map.myvar

console.log result

which outputs:

[ 1, 2, 3 ]