FAQ: Methods, Blocks, & Sorting - Blocks

This community-built FAQ covers the “Blocks” exercise from the lesson “Methods, Blocks, & Sorting”.

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For the following excersize I attempted to x^2 the array utilizing the each method… Attempt 1 is successful but I don’t understand why Attempt 2 and 3 are not

image

Line 23 is unexpected end. That can go. Blocks don’t have a do or end.

Line 13 is a single assignment. Only that last iteration will persist. Define multi as an empty array (before the loop) then << (push) to that array inside the method. (Note. This is akin to mapping.)

What is wrong with my attempt??

my_array = [1, 2, 3, 4, 5]

my_array.each do |n|
  puts n**
end

it writes

(ruby):4: syntax error, unexpected keyword_end

Thank you!!

The exponentation operator requires two operands, the base, and the exponent.

puts n ** 2
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Why does this not work

my_array.each {|i| puts my_array = i*i}

I get this as my error
undefined method `each’ for 25:Fixnum

Welcome to the forums, @jyip1170893189.

What does your array look like?

The array is just

my_array = [1, 2, 3, 4, 5]

The array has the each method act upon its members, one at a time so we don’t need to name it inside the block.

my_array.each { |x| puts x ** 2 }
                / 
         single element
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