stdlib/hash/hashes_parens.rb

tests/_examples/stdlib/hash/hashes_parens.rb in the metorex repository.

# Hash/Dict methods demonstration (with parentheses)

ages = {"alice" => 30, "bob" => 25, "charlie" => 35}

# keys and values
puts(ages.keys.sort)
puts(ages.values.sort)

# has_key?
puts(ages.has_key?("alice"))
puts(ages.has_key?("dave"))

# size
puts(ages.size)

# get with default
puts(ages.get("alice"))
puts(ages.get("dave", 0))

# fetch
puts(ages.fetch("bob"))

# merge
merged = ages.merge({"dave" => 40})
puts(merged.size)

# each
total = 0
ages.each { |k, v| total += v }
puts(total)

# entries
puts(ages.entries.length)

Output:

alice
bob
charlie
25
30
35
true
false
3
30
0
25
4
90
3