CODEWITHSUNDEEP
c#linq
Alexey
Alexey

Reputation: 683

How to join two arrays in C# using a single line of code

I have c# code:

string[] names = new [] { "a", "b", "c" };
int[] vals = new[] { 5, 10, 15 };
r = "";
for( int i = 0; i < names.Length; i++ )
r += names[i] + ": " + vals[i] + " ";

In python I can write oneliner

r = " ".join( [ names[i] + ":" + str(vals[i]) for i in range(len(names)) ] )

How can i do this in c#?

Upvotes: 0

Views: 395

Answers (1)

Jon Skeet
Jon Skeet

Reputation: 1500495

I would take a slightly different approach to the Python code - I'd use the LINQ "zip" operator to produce a sequence of strings you want to join together, then use string.Join to join them:

string result = string.Join(" ", names.Zip(values, (n, v) => $"{n}:{v}");

So within that:

  • The names.Zip(values, <something>) part produces a sequence of values based on applying the "something" to each pair of values from names and values.
  • The (n, v) => $"{n}:{v}" part takes a name and a value, and formats them as name:value.
  • The string.Join(" ", <sequence>) part joins the sequence elements together with a space between each pair of values.

Note that this doesn't end up with a trailing space, unlike the original C# code.

Upvotes: 6

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