- Dec 2023
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www.pluralsight.com www.pluralsight.com
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&& nil
first sighting: I don't think I've seen someone write exactly
&& nilbefore.Apparently to avoid having the return value from
errors.add— which should be done solely for its side effect, not to get a return value -- inadvertently being used as a return value foruser. It wouldn't make sense to return fromuser. That should only return a User or nil. And more statically typed languages would allow that to be expressed/enforced from type annotations alone, which would have caught the mistake of returningerrors.addif someone had accidentally attempted to return that.Having
user(and thereforecall) return nil is key to theunless @current_userworking. -
nil
I appreciate the attention to detail of returning nil if that's what should be returned (rather than accidentally just returning the return value from the last line of code,
errors.add.
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- Sep 2022
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www.postgresql.org www.postgresql.org
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Otherwise behaves according to the value of null_value_treatment which must be one of 'raise_exception', 'use_json_null', 'delete_key', or 'return_target'. The default is 'use_json_null'.
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- Nov 2021
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Check whether a value is defined (non-nullable), meaning it is neither `null` or `undefined`. This can be useful as a type guard, as for example, `[1, null].filter(Boolean)` does not always type-guard correctly.
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- Sep 2021
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twitter.com twitter.com
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Jonathan Robinson on Twitter. (n.d.). Twitter. Retrieved 6 September 2021, from https://twitter.com/jon_m_rob/status/1431734411335176199
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- Jul 2021
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www.postgresql.org www.postgresql.org
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(The null result should not be confused with a SQL NULL; see the examples.)
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