instance method

Set#<<

(A) -> self

<<(p1)

static VALUE
set_i_add(VALUE set, VALUE item)
{
    rb_check_frozen(set);
    if (set_iterating_p(set)) {
        if (!set_table_lookup(RSET_TABLE(set), (st_data_t)item)) {
            no_new_item();
        }
    }
    else {
        set_insert_wb(set, item, NULL);
    }
    return set;
}

Alias of #add

Adds the given object to the set and returns self. Use Set#merge to add many elements at once.

Example

Set[1, 2].add(3)                    #=> Set[1, 2, 3]
Set[1, 2].add([3, 4])               #=> Set[1, 2, [3, 4]]
Set[1, 2].add(2)                    #=> Set[1, 2]

See also #add #< #<= #- also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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