以下代码在Ruby 2.5.1
中编译通过
定义
myHash = Hash.new
myHash1 = Hash["key1" => 100, "key2" => 200]
myHash2 = Hash.new("defualtValue") # 创建带有默认值的Hash,当访问不存在的任意key,返回该值
myHash3 = Hash.new "defualtValue" # 创建带有默认值的Hash,当访问不存在的任意key,返回该值
puts myHash1["key1"] # defualtValue
赋值
myHash = {"key1" => "value1", "key2" => "value2"}
修改/添加元素
myHash["key3"] = 300 # key不存在添加则添加
myHash["key3"] = 200 # key存在则添加value
puts myHash["key3"] # 200
取值
value = myHash["key2"]
元素个数
count = myHash.count
key/value
keys = myHash.keys # 获取所有key
values = myHash.values # 获取所有key
Hash遍历
方法1
myHash.each { |key, value|
puts key
puts value
}
方法2
for key in myHash.keys do
value = myHash[key]
puts value
end
方法3
for value in myHash.values do
puts value
end
方法4
myHash.values.each { |value|
puts value
}
方法5
myHash.keys.each { |key|
puts key
}
还不快抢沙发