# Ruby tip 0001: Initialize hash from string or array

## Problem:

Convert 'ABCD' to `{"A"=>0, "B"=>0, "C"=>0, "D"=>0}`

1. Using `inject`
    
    ```ruby
    'ABCD'.chars.inject({}) { |memo, v| memo[v] = 0; memo  }
    ```
    
2. Using `Hash`
    
    ```ruby
    Hash['ABCD'.chars.map { |v| [v, 0] }]
    ```