CODEWITHSUNDEEP
c#
A.Mat
A.Mat

Reputation: 33

What is the difference between .Any(s => s.Contains) and .Contains?

I've realized that in some old code that I've written in C#, when comparing the occurrence of a string in an array that I've done it like so:

for (var i = 0; i < NounsA.Count; i++)
{
    if (NounsB.Any(s => s.Contains(NounsA[i])))
    {
        --do something--

Where NounsA and NounsB are arrays of words.

I've now just done this:

for (var i = 0; i < NounsA.Count; i++)
{
    if (NounsB.Contains(NounsA[i]))
    {
        --do something--

I've compared the two and they return different values, so what I'm asking is, what does the first one even do?

Upvotes: 2

Views: 433

Answers (1)

Enigmativity
Enigmativity

Reputation: 117010

Let's try this code:

var NounsA = new List<string>() { "a", "b" };
var NounsB = new List<string>() { "aa", "bb" };

{
    for (var i = 0; i < NounsA.Count; i++)
    {
        if (NounsB.Any(s => s.Contains(NounsA[i])))
        {
            Console.WriteLine("!");
        }
    }
}   

{
    for (var i = 0; i < NounsA.Count; i++)
    {
        if (NounsB.Contains(NounsA[i]))
        {
            Console.WriteLine("#");
        }
    }
}

When I run it I get the following output to the console:

!
!

Both blocks are running through the NounsA list, one element at a time, and asking the following questions respectively:

  1. Do any of the strings in NounsB contain as a substring the current value from NounsA?
  2. Do any of the strings in NounsB equal exactly the current value from NounsA?

So in my example the first matches twice as "aa" contains "a" and "bb" contains "b", but the second does not match because neither "aa" nor "bb" equals either of "a" or "b".

Upvotes: 2

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