Question

我有一个哈希，其中键是几个月，我想将对象转换为正数和货币。

INPUT

hash = {
  12 => -5888.969999999999,
  4 => -6346.1,
  3 => -6081.76,
  2 => -5774.799999999999,
  1 => -4454.38
}

输出

hash = {
    12 => 5888.96,
    4 => 6346.10,
    3 => 6081.76,
    2 => 5774.79,
    1 => 4454.38
}

#Output should be a float

非常感谢任何帮助。

Answer 1

尝试

hash.transform_values{|v| v.round(2).abs()}

或

hash.update(hash){|k,v| v.round(2).abs()}

Answer 2

可以应用Numeric.abs（）以确保数字为正数，Float.round（2）将浮点数舍入为2位小数。有关用法示例，请参阅ruby-doc.org/core-2.1.4/Numeric.html#method-i-abs和ruby-doc.org/core-2.2.2/Float.html#method-i-round。请注意，round（）不会添加尾随零，因为这不会影响数值，但是可以通过格式化添加尾随零，例如：

hash = {
  12 => -5888.969999999999,
  4 => -6346.1,
  3 => -6081.76,
  2 => -5774.799999999999,
  1 => -4454.38
}

# transform hash values
hash.each do |key, value|
  hash[key] = value.abs().round(2)
end

# print the modified hash without formatting the values
hash.each do |key, value|
  puts "#{key} => #{value}"
end

# prints 
# 12 => 5888.97
# 4 => 6346.1
# 3 => 6081.76
# 2 => 5774.80
# 1 => 4454.38

# print hash with values formatted with precision of 2 digits
hash.each do |key, value|
  puts "#{key} => #{'%.2f' % value}"
end

# prints
# 12 => 5888.97
# 4 => 6346.10
# 3 => 6081.76
# 2 => 5774.80
# 1 => 4454.38

将哈希红宝石对象转换为正货币

2 个答案: