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Calls the block, if given, with each element; replaces the element with the block's return value:
a = [:foo, 'bar', 2]
a.map! { |element| element.class } # => [Symbol, String, Integer]
Returns a new Enumerator if no block given:
a = [:foo, 'bar', 2]
a1 = a.map!
a1 # => #<Enumerator: [:foo, "bar", 2]:map!>
Array#collect! is an alias for Array#map!.
 
               static VALUE
rb_ary_collect_bang(VALUE ary)
{
    long i;

    RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
    rb_ary_modify(ary);
    for (i = 0; i < RARRAY_LEN(ary); i++) {
        rb_ary_store(ary, i, rb_yield(RARRAY_AREF(ary, i)));
    }
    return ary;
}
            

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