Why Method objects with method() in Ruby? - Purpose & Use Cases

The Big Idea

What if you could grab a method like a tool and use it anywhere without rewriting it?

The Scenario

Imagine you have a list of tasks, and you want to run the same action on each one. Without a simple way to grab that action, you might have to write the same code over and over or pass around confusing blocks of code.

The Problem

Manually repeating code or passing anonymous blocks everywhere is slow and easy to mess up. It's hard to reuse, and you might accidentally change something you didn't mean to. This makes your code messy and frustrating to maintain.

The Solution

Using method() lets you grab a method as an object. You can store it, pass it around, and call it whenever you want. This keeps your code clean, reusable, and easy to understand.

Before vs After

✗ Before

def greet(name)
  "Hello, #{name}!"
end

names = ['Alice', 'Bob', 'Charlie']
names.each { |n| puts greet(n) }

✓ After

def greet(name)
  "Hello, #{name}!"
end

names = ['Alice', 'Bob', 'Charlie']
greet_method = method(:greet)
names.each { |n| puts greet_method.call(n) }

What It Enables

You can treat methods like any other object, making your code more flexible and powerful.

Real Life Example

Think of a chef who writes down a recipe (method) and then shares it with many cooks (code parts) who can use it anytime without rewriting it.

Key Takeaways

Manual repetition is slow and error-prone.

method() captures methods as objects for reuse.

This makes code cleaner, easier to maintain, and more flexible.