method

collect

v1_8_6_287 - Show latest stable - Class: Enumerable

collect()

public

Returns a new array with the results of running block once for every element in enum.

   (1..4).collect {|i| i*i }   #=> [1, 4, 9, 16]
   (1..4).collect { "cat"  }   #=> ["cat", "cat", "cat", "cat"]

/*
 *  call-seq:
 *     enum.collect {| obj | block }  => array
 *     enum.map     {| obj | block }  => array
 *  
 *  Returns a new array with the results of running <em>block</em> once
 *  for every element in <i>enum</i>.
 *     
 *     (1..4).collect {|i| i*i }   #=> [1, 4, 9, 16]
 *     (1..4).collect { "cat"  }   #=> ["cat", "cat", "cat", "cat"]
 *     
 */

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

    rb_iterate(rb_each, obj, rb_block_given_p() ? collect_i : collect_all, ary);

    return ary;
}

2Notes

collect_with_index

noniq · Mar 18, 2010

Use Object#enum_for if you need to collect with index:

require 'enumerator'

%w{foo bar}.enum_for(:each_with_index).collect do |item, index| 
"#{index}: #{item}" 
end

Video Explnation of the collect method

MattStopa · Mar 11, 2012

http://www.youtube.com/watch?v=nn-urr9l7tc

collect

2Notes

collect_with_index

Video Explnation of the collect method

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