Details

Catenate[{expr₁,expr₂,…}] allows the expr_i to be any mixture of lists and associations.
Any of the expr_i with head Missing are ignored.
For an association assoc, Catenate[assoc] is taken to be Catenate[Values[assoc]].

Examples

Catenate several lists:

Wolfram Language code: Catenate[{{a, b, c}, {d, e}, {f, g, h}}]

Catenate associations:

Wolfram Language code: Catenate[{<|a -> 1, b -> 2|>, <|c -> 3, d -> 4|>}]

Catenate effectively flattens the first two levels of a high-dimensional array:

Wolfram Language code: Catenate[ConstantArray[1, {2, 2, 2}]]

Catenate strips the keys, joining all the values:

Wolfram Language code: Catenate[{{1, 2}, <|a -> 1, b -> 2|>}]

Catenate does not override the values for the same keys:

Wolfram Language code: Catenate[{<|a -> 1, b -> 2|>, <|c -> 3, a -> 5|>}]

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