Ruby How to Convert Integer to String Easily

In Ruby, you can convert an integer to a string by calling to_s on the integer, like 123.to_s.

Examples

Input123

Output"123"

Input0

Output"0"

Input-456

Output"-456"

How to Think About It

To convert an integer to a string in Ruby, think of it as changing the number into text form so you can use it where words are needed. Ruby provides a simple way by calling to_s on the number, which turns it into its string equivalent.

Algorithm

1

Take the integer value as input.

2

Call the <code>to_s</code> method on the integer.

3

Return the resulting string.

Code

ruby

number = 123
string_version = number.to_s
puts string_version

Output

123

Dry Run

Let's trace converting the integer 123 to a string.

1

Start with integer

number = 123

2

Convert to string

string_version = number.to_s # string_version is now "123"

3

Print the string

puts string_version # outputs 123

Step	Value
Initial integer	123
After to_s	"123"
Output	123

Why This Works

Step 1: Using to_s method

The to_s method is built into Ruby for integers and converts the number into its string form.

Step 2: Result is a string

After calling to_s, the integer becomes a string that can be used like any text.

Alternative Approaches

String() method

ruby

number = 123
string_version = String(number)
puts string_version

This also converts the integer to a string but is less commonly used than <code>to_s</code>.

Complexity: O(1) time, O(n) space

Time Complexity

Converting an integer to a string takes constant time because it just formats the number.

Space Complexity

The space depends on the number of digits since the string stores each digit as a character.

Which Approach is Fastest?

Both to_s and String() have similar performance; to_s is preferred for readability.

Approach	Time	Space	Best For
to_s method	O(1)	O(n)	Simple and readable conversion
String() method	O(1)	O(n)	Alternative but less common