Square Array

Objectives

1. Practice iterating over an array using the .each method.
2. Practice operating on each element of an array.

Instructions

You will build a method, square_array, that squares each element in an array of numbers and returns a new array of these squared numbers. Use an iterator and implement your own logic, don't use any built-in array methods other than .each (e.g. .collect, .inject).

A couple of questions that you can ask yourself are:

• What is the return value of calling .each on an array?
• How can I operate on each element of an array and also collect or store those elements?
• How can I square a number? Hint: There is more than one way to do it! Google Ruby's exponent operator or refer back to the earlier lesson on simple math.

Advanced

Once you have the tests passing, see if you can implement this with a higher level iterator such as .collect.

Expectation Examples

numbers = [1,2,3]

square_array(numbers)
# => [1,4,9])

new_numbers = [9,10,16,25]

square_array(new_numbers)
# => [81,100,256,625]

Resources

• Ruby Docs - Each Method

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