ruby join hash to string

To join the key-value pairs of a hash into a string in Ruby, you can use the map method to iterate over the hash and convert each pair into a string representation. Then, you can use the join method to concatenate these string representations together. Here is an example:

hash = { "name" => "John", "age" => 30, "city" => "New York" }
result = hash.map { |key, value| "#{key}: #{value}" }.join(", ")
puts result

Explanation of the steps:

Define a hash with key-value pairs: In this example, we have a hash with the keys "name", "age", and "city", and their corresponding values.
Use the map method to iterate over the hash: The map method transforms each key-value pair into a string representation, where the key and value are separated by a colon and a space.
Use string interpolation to format the key-value pairs: Inside the block passed to map, we use string interpolation to combine the key and value into a single string.
Use the join method to concatenate the string representations: After the map operation, we have an array of string representations of the key-value pairs. We use the join method to concatenate these strings together, using a comma and a space as the separator.
Output the result: Finally, we output the resulting string using the puts method.

The output of the above code will be:

name: John, age: 30, city: New York

This is a string representation of the key-value pairs in the hash, joined together with commas and spaces.