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Discover how to effectively loop through an array in `Ruby` with a concise one-liner that eliminates `nil` values and processes your data seamlessly.
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This video is based on the question https://stackoverflow.com/q/63434841/ asked by the user 'Lax_Sam' ( https://stackoverflow.com/u/7773783/ ) and on the answer https://stackoverflow.com/a/63435009/ provided by the user 'benjessop' ( https://stackoverflow.com/u/10610352/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Loop Through an Array in One Line in Ruby

When working with collections in programming, particularly in Ruby, you often need to process or transform data efficiently. One common scenario involves looping through an array to extract specific information—in this case, the spouses of a group of sisters. If you're asking yourself how you can do this in a neat and compact manner, then you're in the right place!

The Challenge

You have an array of sister objects, each of which might have a spouse attribute. You want to create a new array containing only the spouses of these sisters, skipping any that are nil. Here's how you've been iterating through the collection so far:

[[See Video to Reveal this Text or Code Snippet]]

While this works, there's a more Ruby-esque way to achieve the same result in a single line of code. Let's explore how!

The Solution

We can condense the operation into a concise one-liner using Ruby's built-in methods. Here’s an example of how it can be done:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Code

Compact the Array:
sisters.compact removes any nil elements from the sisters array. This step ensures that we only deal with valid sister objects.

Map Spouses:
.map(&:spouse) extracts the spouse attribute from each sister object. The &:spouse shorthand is a neat way to call the spouse method on each object in the array.

Remove nil Spouses:
Another compact is used here to ensure we filter out any nil spouses that may exist after the mapping process.

Concatenation:
Finally, brothers_in_law.concat merges the resulting array of spouses into the brothers_in_law array. Using concat means we can merge multiple elements into the array at once.

Example in Action

Here’s a concrete example to see it in action:

[[See Video to Reveal this Text or Code Snippet]]

Final Thoughts

Using this one-liner approach not only makes your code cleaner and more readable but also leverages Ruby's expressive capabilities. Whenever you handle arrays in Ruby, think about using methods like map, compact, and concat to improve your data manipulation skills.

Armed with this knowledge, you can now loop through arrays in a more polished way in Ruby.



This method allows you to efficiently manage your data while keeping your code concise and elegant. Happy coding in Ruby!