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Ruby Quickies #6

Procs on the Go

Is the line of code below valid Ruby code?

-> (a) {p a}[“Hello world”]

Yes, it’s valid. Here’s how to understand what it does:

Ruby Quickies #5

Manipulating Strings

Given:

x = “hello”

Can you explain the difference between:

x += “ world”

and

x.concat “ world”

Ruby Quickes #4

Methods & Expressions

Consider:

def foo(x)
  puts x * 2
end