map!() public

Invokes the block once for each element of self, replacing the element with the value returned by block. See also Enumerable#collect.

If no block is given, an enumerator is returned instead.

a = [ "a", "b", "c", "d" ]
a.collect! {|x| x + "!" }
a             #=>  [ "a!", "b!", "c!", "d!" ]
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