Question

I have

int[] source = new[]{ 1, 3, 8, 9, 4 };

What linq query should I write in order to replace all values in the source, below some threshold, with zeros?

Answer 1

int threshold = 2;
int[] dest = source.Select(i => i < threshold ? 0 : i).ToArray();

If you don’t want to create a new array but use the old:

for(int index=0; index < source.Length; index++)
{
    if(source[index] < threshold)
       source[index] = 0;
}