将数组值转换为哈希键

Posted 2021-02-27

Useful for speeding up searches.

# a is the array we want to turn into a hash
Hash[*a.zip([true] * a.size).flatten]
 
# Example:
people= %w[John Mary Paul]
query_people=Hash[*people.zip([true] * people.size).flatten]
 
query_people["John"] # returns true
query_people["Wenceslas"] # returns nil (equivalent to false in most tests)