帮助与LINQ表达 [英] Help with LINQ Expression
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问题描述
如何写一个LINQ表达式,给出Fibonacci数趴在一定范围内的列表(方法调用语法首选),比如说1到1000?
How to write a LINQ Expression (method call syntax preferred) that gives a list of fibonacci numbers lying within a certain range, say 1 to 1000 ?
推荐答案
确定;对于更多的FP的答案:
OK; for a more "FP" answer:
using System;
using System.Collections.Generic;
using System.Linq;
static class Program
{
static void Main()
{
Func<long, long, long, IEnumerable<long>> fib = null;
fib = (n, m, cap) => n + m > cap ? Enumerable.Empty<long>()
: Enumerable.Repeat(n + m, 1).Concat(fib(m, n + m, cap));
var list = fib(0, 1, 1000).ToList();
}
}
注意在理论上这可以写成单个拉姆达,但那是很硬一>
Note that in theory this can be written as a single lambda, but that is very hard.
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