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Returning values from lambdas expressions?


Returning values from lambdas expressions?

By : user2955579
Date : November 22 2020, 10:40 AM
it should still fix some issue As suggested, if you only need to determine if any of the interfaces return true from `clicked() then use:
code :
Interface.interfaces.values().stream().anyMatch(Interface::_clicked))
Interface.interfaces.stream().map(Interface::_clicked).reduce(false, (a, b) -> a || b);


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Is there a way to more easily combine Expressions and lambdas?

Is there a way to more easily combine Expressions and lambdas?


By : Kylin
Date : March 29 2020, 07:55 AM
To fix the issue you can do Writing a MemberInit expression is not so painful compared to what you did for a Tuple. Just for the record, it would be something like this:
code :
public static Expression<Func<TIn, WithInput<TIn, TOut>>> WithInput<TIn, TOut>(
    this Expression<Func<TIn, TOut>> expression)
{
    var parameter = expression.Parameters[0];
    var resultType = typeof(WithInput<TIn, TOut>);
    var body = Expression.MemberInit(Expression.New(resultType),
        Expression.Bind(resultType.GetProperty("Input"), parameter),
        Expression.Bind(resultType.GetProperty("Output"), expression.Body));
    return Expression.Lambda<Func<TIn, WithInput<TIn, TOut>>>(body, parameter);
}
using LinqKit;

public static Expression<Func<TIn, WithInput<TIn, TOut>>> WithInput<TIn, TOut>(
    this Expression<Func<TIn, TOut>> expression)
{
    return Linq.Expr((TIn input) => new WithInput<TIn, TOut>
    {
        Input = input,
        Output = expression.Invoke(input)
    }).Expand();
}
Why does returning lambdas between branches of ternary operator work for some lambdas?

Why does returning lambdas between branches of ternary operator work for some lambdas?


By : Du Edu
Date : March 29 2020, 07:55 AM
it should still fix some issue The first snippet compiles because both lambdas are implicitly convertible to int(*)(int), so the compiler can use that as the type of the ?: expression and thus to deduce the type of result.
If the capture list is non-empty (case 2) no such conversion to pointer-to-function exists (5.1.2/6 in N4141), so we end up with two unrelated types with no common implicit conversion target as the 2nd and 3rd operand of operator?: and thus the type of the ternary expression can no longer be deduced.
Expressions vs Lambdas

Expressions vs Lambdas


By : Daniel
Date : March 29 2020, 07:55 AM
around this issue A lambda expression is a compiler feature that is compiled, depending on context, into one of two things:
A (hidden) function and a delegate to it An Expression
Lambda Expressions: Returning Multiple Values

Lambda Expressions: Returning Multiple Values


By : mcheema
Date : March 29 2020, 07:55 AM
This might help you Your tuple is not binding correctly - the lambda is ending at the first comma. Put parens around the tuple:
named class expressions returning different values

named class expressions returning different values


By : LP77
Date : March 29 2020, 07:55 AM
With these it helps
why it is returning this value as array with one element ie [Function: rectangle2] ?
code :
 console.log(
   {}, // [Object object]
   new Map, // [Object Map]
   function() {}, // [Function]
 );
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