method

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v2_5_5 - Show latest stable - 0 notes - Class: Array

|(p1) public

Set Union — Returns a new array by joining ary with other_ary, excluding any duplicates and preserving the order from the given arrays.

It compares elements using their #hash and #eql? methods for efficiency.

[ "a", "b", "c" ] | [ "c", "d", "a" ]    #=> [ "a", "b", "c", "d" ]
[ "c", "d", "a" ] | [ "a", "b", "c" ]    #=> [ "c", "d", "a", "b" ]

See also Array#uniq.

Show source

static VALUE
rb_ary_or(VALUE ary1, VALUE ary2)
{
    VALUE hash, ary3;
    long i;

    ary2 = to_ary(ary2);
    if (RARRAY_LEN(ary1) + RARRAY_LEN(ary2) <= SMALL_ARRAY_LEN) {
        ary3 = rb_ary_new();
        for (i=0; i<RARRAY_LEN(ary1); i++) {
            VALUE elt = rb_ary_elt(ary1, i);
            if (rb_ary_includes_by_eql(ary3, elt)) continue;
            rb_ary_push(ary3, elt);
        }
        for (i=0; i<RARRAY_LEN(ary2); i++) {
            VALUE elt = rb_ary_elt(ary2, i);
            if (rb_ary_includes_by_eql(ary3, elt)) continue;
            rb_ary_push(ary3, elt);
        }
        return ary3;
    }

    hash = ary_make_hash(ary1);
    for (i=0; i<RARRAY_LEN(ary2); i++) {
        VALUE elt = RARRAY_AREF(ary2, i);
        if (!st_update(RHASH_TBL_RAW(hash), (st_data_t)elt, ary_hash_orset, (st_data_t)elt)) {
            RB_OBJ_WRITTEN(hash, Qundef, elt);
        }
    }
    ary3 = rb_hash_values(hash);
    ary_recycle_hash(hash);
    return ary3;
}

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