method

minmax

Ruby latest stable (v1_9_3_392) - 0 notes - Class: Enumerable

minmax() public

Returns two elements array which contains the minimum and the maximum value in the enumerable. The first form assumes all objects implement Comparable; the second uses the block to return a <=> b.

a = %w(albatross dog horse)
a.minmax                                  #=> ["albatross", "horse"]
a.minmax {|a,b| a.length <=> b.length }   #=> ["dog", "albatross"]

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static VALUE
enum_minmax(VALUE obj)
{
    struct minmax_t memo;
    VALUE ary = rb_ary_new3(2, Qnil, Qnil);

    memo.min = Qundef;
    memo.last = Qundef;
    if (rb_block_given_p()) {
        rb_block_call(obj, id_each, 0, 0, minmax_ii, (VALUE)&memo);
        if (memo.last != Qundef)
            minmax_ii_update(memo.last, memo.last, &memo);
    }
    else {
        rb_block_call(obj, id_each, 0, 0, minmax_i, (VALUE)&memo);
        if (memo.last != Qundef)
            minmax_i_update(memo.last, memo.last, &memo);
    }
    if (memo.min != Qundef) {
        rb_ary_store(ary, 0, memo.min);
        rb_ary_store(ary, 1, memo.max);
    }
    return ary;
}

minmax

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