method

enum_with_index

v1_8_7_72 - Show latest stable - 1 note - Class: Enumerable

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What's this?

enum_with_index() public

Calls block with two arguments, the item and its index, for each item in enum.

   hash = Hash.new
   %w(cat dog wombat).each_with_index {|item, index|
     hash[item] = index
   }
   hash   #=> {"cat"=>0, "wombat"=>2, "dog"=>1}

Show source

/*
 *  call-seq:
 *     enum.each_with_index {|obj, i| block }  -> enum
 *
 *  Calls <em>block</em> with two arguments, the item and its index, for
 *  each item in <i>enum</i>.
 *
 *     hash = Hash.new
 *     %w(cat dog wombat).each_with_index {|item, index|
 *       hash[item] = index
 *     }
 *     hash   #=> {"cat"=>0, "wombat"=>2, "dog"=>1}
 *
 */

static VALUE
enum_each_with_index(obj)
    VALUE obj;
{
    VALUE memo;

    RETURN_ENUMERATOR(obj, 0, 0);

    memo = 0;
    rb_iterate(rb_each, obj, each_with_index_i, (VALUE)&memo);
    return obj;
}

August 23, 2008

0 thanks

Needs requiring 'enumerator' to work

This method needs that you

require 'enumerator'

for this method to be available.

enum_with_index

Related methods

Needs requiring 'enumerator' to work