如何在Ruby中将Fixnum转换为Integer

Question

I am trying to get Integers, but i am getting 'Fixnum' values.

For Eg:

arr = ["1", "2", "3", "4"]
arr.each do |a|
m = a.to_i
m.class.name

Result
=> Fixnum

According to the above example, how can i get Integer values? Fixnum is a Integer only but while implementing one plugin, it will through an error like 'Please enter only integer'.

Answer 1

In Ruby integers are either of the class Fixnum or Bignum for bigger numbers. Both of them inherit from the Integer class.

So you already got an integer, no need to convert it further.

1.class #=> Fixnum
1.class.superclass #=> Integer

---

To convert the array elements to integers you would do this:

arr = ["1", "2", "3", "4"]
arr.map(&:to_i) #=> [1, 2, 3, 4]

Answer 2

Fixnum is the ruby class for standard integers.

Well to be specific, the Integer class covers both Fixnum s and Bignum s, but in all honesty there's nothing to done here.

Answer 3

All Fixnum (s) are already Integer . Here is some sample:

"12".to_i.class
#=> Fixnum
"12".to_i.integer?
#=> true
"12".to_i.to_int
#=> 12

The above all is possible as-

"12".to_i.class.superclass
#=> Integer