a-plus-abs-b

a-plus-abs-b.cs

namespace FunctionalCSharp
{
    using System;

    using Shouldly;

    using Xunit;

    public class Tests
    {
        [Fact]
        public void Elementary_blocks()
        {
            Func<int, int, bool> gt = (a, b) => a > b;
            Func<int, int, int> add = (a, b) => a + b;
            Func<int, int, int> sub = (a, b) => a - b;
            Func<bool, Func<int, int, int>, Func<int, int, int>, Func<int, int, int>> @if =
                (condition, @then, @else) => condition ? @then : @else;
            Func<int, int, int> a_plus_abs_b = (a, b) => @if(gt(b, 0), add, sub)(a, b);

            a_plus_abs_b(5, -4).ShouldBe(9);
        }

        [Fact]
        public void Non_functional_way()
        {
            Func<int, int, int> a_plus_abs_b = (a, b) => a + Math.Abs(b);

            a_plus_abs_b(5, -4).ShouldBe(9);
        }
    }
}

What do you mean? The execution is already delayed as @if is an expression.

…

On Mon, Feb 6, 2012 at 4:12 PM, Mauricio Scheffer < ***@***.*** > wrote: You need to delay the condition to make it work like a regular 'if'. E.g. use a Func<bool> parameter instead of bool --- Reply to this email directly or view it on GitHub: https://gist.github.com/1336143