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Keys

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Keys[<| $key_1$ -> $val_1$, $key_2$ -> $val_2$, ...|>]

return a list of the keys keyi in an association.

Keys[{$key_1$ -> $val_1$, $key_2$ -> $val_2$, ...}]

return a list of the $key_i$ in a list of rules.

• • Keys[<|a -> x, b -> y|>]

• • Keys[{a -> x, b -> y}]

Keys automatically threads over lists:

• • Keys[{<|a -> x, b -> y|>, {w -> z, {}}}]

Keys are listed in the order of their appearance:

• • Keys[{c -> z, b -> y, a -> x}]