Ruby | Enumerable reverse_each() function

Ruby | Enumerable each_with_index() function

Last Updated : 05 Dec, 2019

The each_with_index() of enumerable is an inbuilt method in Ruby hashes the items in the enumerable according to the given block. In case no block is given, then an enumerator is returned.

Syntax: enu.each_with_index { |obj| block } Parameters: The function takes the block which is used to initialise the index to the individual objects. Return Value: It returns the enumerator, if no block is given, else it hashes the items.

Example 1:

ruby

# Ruby program for each_with_index method in Enumerable

# Initialize 
hashing = Hash.new
enu = [7, 9, 10]


enu.each_with_index { |item, index|
  hashing[item] = index
}

# prints hash
puts hashing

Output:

{7=>0, 9=>1, 10=>2}

Example 2:

ruby

# Ruby program for each_with_index method in Enumerable

# Initialize 
hashing = Hash.new
enu = [7, 9, 10]


enu.each_with_index

Output:

Enumerator: [7, 9, 10]:each_with_index

Ruby | Enumerable reverse_each() function

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