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Discussion on: Mastering Ruby Arrays

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codeandclay profile image
Oliver •

As well as concatinating an array with + you can use - to show you the difference.

[1,2,3,4,5] - [3,4,5] #[1, 2]
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& returns the intersection of two arrays. (Items that both arrays contain.)

[1,2,3,4,5] & [4,5,6,7] #[4, 5]
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| returns a union. (A combination of both arrays without duplicates.)

[1,2,3,4] | [1,2,3,5] #[1, 2, 3, 4, 5]
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Also, the constructor takes a block -- which can be handy.

Array.new(3) #[nil, nil, nil]

Array.new(3) { [*1..100].sample } #[24, 61, 76]
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ericchapman profile image
Eric The Coder •

Thanks a million, I just update the post! I did not even know the union and intersection exist! After 2 years of Ruby I am still impress how easy it is compare to other programming language.

Those are powerful and complex Array operators but Ruby make those so easy to use.

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codeandclay profile image
Oliver •

Yes, handling strings and collections in Ruby is a breeze. Those methods are ones I use often so were off the top of my head.