method

select

v1_8_6_287 - Show latest stable - 0 notes - Class: Hash

select(...) public

Returns a new array consisting of [key,value] pairs for which the block returns true. Also see Hash.values_at.

   h = { "a" => 100, "b" => 200, "c" => 300 }
   h.select {|k,v| k > "a"}  #=> [["b", 200], ["c", 300]]
   h.select {|k,v| v < 200}  #=> [["a", 100]]

Show source

/*
 *  call-seq:
 *     hsh.select {|key, value| block}   => array
 *  
 *  Returns a new array consisting of <code>[key,value]</code>
 *  pairs for which the block returns true.
 *  Also see <code>Hash.values_at</code>.
 *     
 *     h = { "a" => 100, "b" => 200, "c" => 300 }
 *     h.select {|k,v| k > "a"}  #=> [["b", 200], ["c", 300]]
 *     h.select {|k,v| v < 200}  #=> [["a", 100]]
 */

VALUE
rb_hash_select(argc, argv, hash)
    int argc;
    VALUE *argv;
    VALUE hash;
{
    VALUE result;

    if (argc > 0) {
        rb_raise(rb_eArgError, "wrong number of arguments (%d for 0)", argc);
    }
    result = rb_ary_new();
    rb_hash_foreach(hash, select_i, result);
    return result;
}

select

Related methods