ruby - Remove element from array by type -

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i have following array:

["--",1,2,3,4]

how can remove elements array element type, ie. remove non-integer values array?

i'd :-

ary = ["--",1,2,3,4] ary = ary.grep(integer)  ary # => [1, 2, 3, 4]

note :- if don't want mutate original array use new_ary instead of ary. like

new_ary = ary.grep(integer)

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