Invert array/object data

gistfile1.coffee

headings = []
_.each o.groups, (group, label) =>
    headings.push(label)

groups = {}
_.each o.headings, (heading) =>
    groups[heading] = values: []

_.each headings, (heading, i) =>
    _.each o.groups[Object.keys(o.groups)[i]].values, (val, j) =>
        groups[Object.keys(groups)[j]].values.push(val)

o.headings = headings
o.groups = groups
copy JSON.stringify o