JJ.Framework.Existence.Core 4.1.5729

Existence.Core

Ever find yourself trying to decide on IsNullOrEmpty, IsNullOrWhiteSpace, a null check, empty list check or whether you should check at all?

Well, no more. Now you just type Has(text) or Has(collection) and be done with it.

Background

Nothing isn't one thing in .NET. It's null, default, white space, 0, NaN, Empty, Length = 0, !Equals(x, default(T?)) && !Equals(x, default(T)). It gets absurd with the many states of nothingness in .NET.

Here we coin the term nully. Don't blame us; the concept already existed, just nobody gave it a name yet.

Features

Grab these methods instead of wrestling with these checks. Your code (and your brain) will thank you:

• Has / FilledIn / IsNully

  • One step beyond null treating empty strings / white space / 0 / empty lists as nully.

• Coalesce

  • Pick the first non-nully value (?? on steroids).

• In / Contains

  • "Is this in that?" tests for collections.

• Is

  • Loose equality (case/trim-insensitive, etc.) when you don't care about exact matches.

Flags for special occasions:

• spaceMatters

  • At times, you really care if your string is just a single space.

• zeroMatters

  • Flip the switch if you consider 0 meaningful.

• caseMatters

  • To keep us sane as long as possible, the default is to not trip over case mismatches: GREEN = green. The caseMatters flag can make things stricter and case-sensitive again.

Examples

list = list.Where(FilledIn);

if (number.IsNully()) return;

if (Has(name)) sb.Append($" {name} ");

Coalesce(" ", Null, "Hi!") == "Hi!"

"\r\n GREEN\t  ".Is("Green")

"GREEN".In("Red", "Green","Blue") == true!

Coming Soon

• flex mode – force a full runtime type lookup on values when you're feeling adventurous.
• char quirks – treat lone ' ' as nully by default (no more sneaky space bugs).
• float drama – NaN, ∞, +0/–0 all count as empty.
• enum safety net – invalid enum values get flagged as nully instead of blowing up.
• all-null collections – if every item is null, the whole collection is officially empty.
• ultra-loose Is – 10.Is("10") regardless of type, because how will we stay sane if 10 isn't 10?

Release Notes

2025-06-14 | 2.5 : Existence.Core

• Initial release

2025-06-24 | 2.6 : Flags

• spaceMatters flags everywhere
• caseMatters replaced ignoreCase
• StringBulder/string more combos possible
• x.In(a, b, c) extension favored over static In(x, a, b, c)

2025-07-02 | 2.7 : Legacy Lineage

• Separate Legacy version lineages.
• For more stable package updates.
• Expanded IntelliSense docs.

2025-07-21 | 2.8 : Trimmable Libs

• Compatibility with AOT "Ahead-Of-Time" native compilation, code trimming and single-executable, self-contained apps.

2026-01-25 | 2.9 : zeroMatters

• Flag when you consider 0 meaningful (not nully)

2026-01-27 | 3.0 : .NET 10

• Upgraded with explicit support for .NET 10

2026-01-28 | 3.1 : Less Prios

• Simplify overload picking removing some [Prio] attributes.
• Sacrifices direct use of keywords e.g. Coalesce(null, "Hallo"); not a real use case anyway.

2026-01-30 | 3.2 : Leading Flags - Coalesce

• Flags at the beginning of the parameter list, now don't come with a performance penalty.

2026-01-31 | 3.3 : Leading Flags - Contains

• More notation options for flags for the Contains method

2026-02-01 | 3.4 : Leading Flags - FilledIn

• Support flags in front for the FilledIn method

2026-02-17 | 3.7 : Clash of the Booleans

• Leading flags for Has/Is/In/IsNully (supplements trailing flags)
• Improved Coalesce resolution and performance for 4+ values and collections.
• Added overloads for reduced clashes between bool flags and value lists.
• Various non-critical renames for clarity and modularity.

2026-02-23 | 3.8 : Business.Legacy

• Added project properties hardening code trimming and native compile compatibility.
• During a release of another library: JJ.Framework.Business.Legacy

🐨 Mr. Koala

Special thanks to Mr. Koala. Once you think of koalas when you read 🐨 Coalesce, you can never unsee it. Mr. Koala eats your nullies. Nully nums are his favorite!

💬 Feedback

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