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Linq to object Multiple Where short circuit evaluation


Linq to object Multiple Where short circuit evaluation

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Linq to object Multiple Where short circuit evaluation
Tag : chash , By : Cube_Zombie
Date : November 29 2020, 04:01 AM

wish of those help Let's take a look at some more code. We'll test both scenarios:
First we will test for && by using two if statements We'll use two Where calls
var elements = new List<string>(new[] { "A", "B", "C" });

Console.WriteLine("C#'s &&");

elements.Where(x => {
    if (x == "A")
    {
        Console.WriteLine("ConditionA is true");
        if (1 == 1)
        {
            Console.WriteLine("ConditionB is true");
            return true;
        }

        Console.WriteLine("ConditionB is false");
    }

    Console.WriteLine("ConditionA is false");

    return false;           
}).ToList();

Console.WriteLine();
Console.WriteLine("Double Linq.Where");

elements.Where(x => {
    if (x == "A")
    {
        Console.WriteLine("ConditionA is true");
        return true;
    }

    Console.WriteLine("ConditionA is false");
    return false;           
})
    .Where(x => {
        if (1 == 1)
        {
            Console.WriteLine("ConditionB is true");
            return true;
        }

        Console.WriteLine("ConditionB is false");
        return false;
    }).ToList();
C#'s &&
ConditionA is true
ConditionB is true
ConditionA is false
ConditionA is false

Double Linq.Where
ConditionA is true
ConditionB is true
ConditionA is false
ConditionA is false

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Does LINQ do short-circuit evaluation in VB.NET?


Tag : vb.net , By : Eniac
Date : March 29 2020, 07:55 AM
may help you . I'm pretty sure that your query is safe, at least following sample code is:
Dim dateList As New List(Of Nullable(Of Date))
For i As Int32 = 0 To 12
    If (i Mod 3 = 0) Then
        dateList.Add(Nothing)
    Else
        dateList.Add(New Date(2012, i, 1))
    End If
Next
Dim july = New Date(2012, 7, 1)
Dim fromJuly = (From m In dateList
      Where m.HasValue AndAlso m.Value.Date >= july).ToList

Any difference between Lazy evaluation and Short-circuit evaluation?


Tag : algorithm , By : Tim
Date : March 29 2020, 07:55 AM
it helps some times The difference is that in case of lazy evaluation an expression is evaluated only when it is needed, while in case of short-circuit evaluation expression evaluation stops right after you know the result. It's sort of orthogonal notions.
Lazy evaluation can be applied to any computation (short-circuit scheme usually is used only with bools). It doesn't cut-off useless computation, but delays the whole computation until its result is required.
variable = bigAndSlowFunc() or evenSlowerFnc()
if (carry out heavy computations)
  print "Here it is: ", variable
else
  print "As you wish :-)"

converting short-ciruit evaluation to non short-circuit evaluation


Tag : cpp , By : user134570
Date : March 29 2020, 07:55 AM
may help you . I have to rewrite this segment of code code that assumes short-circuit evaluation of Boolean expressions:
while(true)
{
    if (p == NULL)
        break;
    if (p->val == v)
        break;
    p = p->next;
}

Why can't Typescript detect that an object is defined when using && short-circuit evaluation of multiple levels


Tag : typescript , By : Nandor Devai
Date : March 29 2020, 07:55 AM
may help you . This is a known bug in TypeScript. For whatever reason, reading a non-literal property on an object type with an index signature doesn't act as a type guard on that property. It looks like this is being tracked in the following GitHub issues:
microsoft/TypeScript#17960 "property accesses on string index signatures should narrow" microsoft/TypeScript#29042 "this[variable] and this[stringLiteral] have different behavior"
let cAts: AnnotationObjectByType | undefined;
if (chartAnnotations[ts] && (cAts = chartAnnotations[ts][side]) && cAts[type]) {

}
const cAtst = chartAnnotations?.[ts]?.[side]?.[type]; // string | undefined
if (chartAnnotations[ts] && chartAnnotations[ts][side] && chartAnnotations[ts][side]![type]) { }

Is order of evaluation gauranteed with short circuit evaluation?


Tag : c , By : cameron
Date : March 29 2020, 07:55 AM
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