ruby - 带小数位的范围

Question

如何在 ruby​​ 中检查带小数位的范围？

我想在 ruby​​ 中过滤 9.74 - 9.78 之间的数组

if (9.74...9.78) == amounts
count += 1
end

这好像不行

Answer 1

使用 Range#cover 执行此操作:

if (9.74...9.78).cover? amounts
    count += 1
end

示例:

p (9.74...9.78).cover? 9.75 # => true
p (9.74...9.78).cover? 9.79 # => false

按照@m_x 的建议更新

# will give you the element in the range
array.select{ |item| (9.74..9.78).cover? item }
# will give you the element count in the array belongs to the range
array.count{ |item| (9.74..9.78).cover? item }