keys :: Hash

keys() -> [String...] Provides an Array of keys (that is, property names) for the hash.

Note: the order of key names is browser-dependent (based on the for…in loop). Also, this currently skips any property whose value is a function (such as hash methods).

Examples

$H({ name: 'Prototype', version: 1.5 }).keys().sort()

// -> ['name', 'version']

$H().keys()

// -> []

Prototype API 1.5.0 - prototypejs.org