method

reject

v1_8_7_330 - Show latest stable - 1 note - Class: Enumerable

reject() public

Returns an array for all elements of enum for which block is false (see also Enumerable#find_all).

(1..10).reject {|i|  i % 3 == 0 }   #=> [1, 2, 4, 5, 7, 8, 10]

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/*
 *  call-seq:
 *     enum.reject {| obj | block }  => array
 *
 *  Returns an array for all elements of <i>enum</i> for which
 *  <em>block</em> is false (see also <code>Enumerable#find_all</code>).
 *
 *     (1..10).reject {|i|  i % 3 == 0 }   #=> [1, 2, 4, 5, 7, 8, 10]
 *
 */

static VALUE
enum_reject(obj)
    VALUE obj;
{
    VALUE ary = rb_ary_new();

    RETURN_ENUMERATOR(obj, 0, 0);
    rb_iterate(rb_each, obj, reject_i, ary);

    return ary;
}

September 9, 2013

1 thank

Using reject to remove key/value pairs from a hash

Code example

# Remove empty strings
{ a: 'first', b: '', c: 'third' }.reject { |k,v| v.empty? } #=> {:a=>"first", :c=>"third"}

# Remove nil
{a: 'first', b: nil, c: 'third'}.reject { |k,v| v.nil? } # => {:a=>"first", :c=>"third"}

# Remove nil & empty strings
{a: '', b: nil, c: 'third'}.reject { |k,v| v.nil? || v.empty? } # => {:c=>"third"}

reject

Related methods

Using reject to remove key/value pairs from a hash

Code example