Ruby add nil value to an array

Question

How can I initialize an array and be able to add nil value to it? as I know Array.wrap doesn't do the job.

list = Array.wrap(nil) => []

What I want:

list = Array.add(nil) => [nil]

Thank you

Based on the comments it appears that the question is, “How can I create an array that contains a single, given object?”. Correct? If so, do as @engineersmnky suggests, replacing nil with the given object if it is something other than nil. If the object is held by a variable x, write [x]. — Cary Swoveland
– Cary Swoveland, Commented Feb 19, 2020 at 17:04

Mark · Accepted Answer · 2020-02-19 14:39:34Z

1

Try:

list = Array.new(1)

The number fed in as an argument dictates how many nils are added:

list = Array.new(3)
=> [nil, nil, nil]

answered Feb 19, 2020 at 14:39

Mark

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6 Comments

nanakondor Over a year ago

I'm adding a variable to the array and I don't know if its nil or not. like Array.wrap(item)

Stefan Over a year ago

@nanakondor just write [item]

Mark Over a year ago

The question was literally How can I initialize an array and be able to add nil value to it?

engineersmnky Over a year ago

@nanakondor What @Stefan said but if item can also be an Array I would change this to [*item] to better simulate the way Array#wrap works (which by the way is a rails method so I added the rails tag.

Stefan Over a year ago

@engineersmnky although having to deal with objects that can either be nil or arrays or non-arrays might indicate some underlying problems.

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iGian · Accepted Answer · 2020-02-19 16:29:18Z

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