Integer Methods

Conversion

.to_f

Convert to Float.

puts 42.to_f 

→ 42.0

.to_s

Convert to String.

puts 42.to_s 

→ "42"

.to_i

Return self — no-op, but useful in generic code where the type isn't known.

puts 42.to_i

→ 42

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Iteration

.times do |i|

Repeat a block exactly n times. i counts from 0 to n-1.

3.times do |i|
  puts i 
end

→ 0, 1, 2

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Standalone functions

What do you want	How you do it Frankie
Absolute value	abs(n)
Is it zero?	n == 0
Is it even?	n % 2 == 0
Is it odd?	n % 2 != 0
Is it positive?	n > 0
Clamp to range	clamp(n, lo, hi)
Square root	sqrt(n)
Random integer	rand_int(a, b)
Type check	is_integer(n)