Locals

Simple collection on stack. Use to store a small number of items (up to 7) without allocating an intermediate collection.

Performance

Enumerable without allocation

Method	Count	Mean	Error	StdDev	Ratio	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
List	5	75.42 ns	0.523 ns	0.437 ns	1.00	0.00	0.0153	-	-	96 B
LocalVector	5	63.55 ns	0.369 ns	0.327 ns	0.84	0.01	-	-	-	-
List	7	85.89 ns	1.578 ns	1.938 ns	1.00	0.00	0.0178	-	-	112 B
LocalVector	7	77.24 ns	0.332 ns	0.310 ns	0.90	0.02	-	-	-	-
List	10	96.96 ns	0.827 ns	0.691 ns	1.00	0.00	0.0216	-	-	136 B
LocalVector	10	108.74 ns	0.633 ns	0.561 ns	1.12	0.01	0.0076	-	-	48 B

Execute linq-like operations

Method	Count	Mean	Error	StdDev	Ratio	Gen 0	Gen 1	Gen 2	Allocated
List	5	76.99 ns	0.880 ns	0.823 ns	1.00	0.0153	-	-	96 B
LocalVector	5	63.75 ns	0.451 ns	0.376 ns	0.83	-	-	-	-
List	7	84.01 ns	0.833 ns	0.739 ns	1.00	0.0178	-	-	112 B
LocalVector	7	77.07 ns	0.309 ns	0.289 ns	0.92	-	-	-	-
List	10	93.43 ns	0.513 ns	0.455 ns	1.00	0.0216	-	-	136 B
LocalVector	10	107.94 ns	0.424 ns	0.376 ns	1.16	0.0076	-	-	48 B

Install from nuget

Install Locals with the following command from nuget:

Install-Package Locals

Usage

var vector = new LocalVector<Foo>(); // it's ref struct
vector.Add(new Foo { Value = 1 });
vector.AddRange(items);

return vector
    .Where((item, arg) => item.Value > arg, argument)
    .OrderBy(item => item.Value)
    .Select(item => item.Value)
    .Max();