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Editorial Team
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Asked: 2026-05-26T14:46:32+00:00

if !store.url.nil? and store.url != store.new_data.url OR if ! store.url.nil? && store.url != store.new_data.url

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if !store.url.nil? and store.url != store.new_data.url

OR

if ! store.url.nil? && store.url != store.new_data.url

OR

if (!store.url.nil? && store.url != store.new_data.url)

Main items I’d like to get advice on:

  1. Is it better to put a space after the bang?

  2. && -or- and

  3. || -or- or

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1 Answer

  1. Editorial Team

    You must always use “&&” or “||” in an boolean statement.

    “and” and “or” should be used for control flow like if or unless.

    If you’re working in Rails, you can also do

    if store.url.present? && store.new_data.url != store.url

    Do not put spaces after the negation exclamation. Using brackets willy nilly is frowned upon in the general ruby coding conventions, so avoid if you can.

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