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instance method

Enumerable#each_with_index

enum.each_with_index(*args) { |obj, i| block } → enum

enum.each_with_index(*args) → an_enumerator

static VALUE
enum_each_with_index(int argc, VALUE *argv, VALUE obj)
{
    struct MEMO *memo;

    RETURN_SIZED_ENUMERATOR(obj, argc, argv, enum_size);

    memo = MEMO_NEW(0, 0, 0);
    rb_block_call(obj, id_each, argc, argv, each_with_index_i, (VALUE)memo);
    return obj;
}

Calls block with two arguments, the item and its index, for each item in enum. Given arguments are passed through to each().

If no block is given, an enumerator is returned instead.

Example

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

See also #each_slice #each_with_object #each_entry #entries also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1

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