tafel
A Ruby library to turn pieces of data into arrays of arrays (tables).
interface
Tafel provides 3 main methods.
Tafel .to_htable .to_h
Turns the argument into a table where keys are arrayed horizontally.
require 'tafel'
#
# hash of hashes
Tafel.to_h(
{
'USD' => { code: 'USD', change: 1.0, min: 500, status: 'active' },
'EUR' => { code: 'EUR', change: 1.07, status: 'active' },
'CHF' => { code: 'CHF', change: 1.08, min: 700 }
}
)
# ==>
[
[ :key, :code, :change, :min, :status ],
[ 'USD', 'USD', 1.0, 500, 'active' ],
[ 'EUR', 'EUR', 1.07, nil, 'active' ],
[ 'CHF', 'CHF', 1.08, 700, nil ]
]
#
# array of hashes
Tafel.to_htable(
[
{ a: 1, b: 2 },
{ a: 3, b: 4, c: 5 },
{ a: 6, c: 7 }
]
)
# ==>
[
[ :a, :b, :c ],
[ 1, 2, nil ],
[ 3, 4, 5 ],
[ 6, nil, 7 ]
]
#
# plain hash
Tafel.to_htable(
{ a: 3, b: 4, c: 5 }
)
# ==>
[
[ :a, :b, :c ],
[ 3, 4, 5 ]
]Tafel .to_vtable .to_v
Turns the argument into a table where keys are arrayed vertically.
It leaves non-array and no-hash instances as is.
require 'tafel'
Tafel.to_v(
{ interpreter: 'Leo Ferre', song: { name: "C'est extra", year: 1969 } }
)
# ==>
[
[ :interpret, 'Leo Ferre' ],
[ :song, [ [ :name, "C'est extra" ], [ :year, 1969 ] ] ]
]It accepts a limit integer parameter defaulting to -1 (recurse entirely). For example:
Tafel.to_v(
{ interpreter: 'Leo Ferre', song: { name: "C'est extra", year: 1969 } },
1
)
# ==>
[
[ :interpret, 'Leo Ferre' ],
[ :song, { name: "C'est extra", year: 1969 } ]
]Tafel.flatten
Turns nested tables into a single table.
require 'tafel'
Tafel.flatten(
[ [ 0, 1 ],
[ 2, [ [ 3, 4 ], [ 5, 6 ] ] ] ]
)
# -->
[ [ 0, 1, nil ],
[ 2, 3, 4 ],
[ nil, 5, 6 ] ]license
MIT, see LICENSE.txt