06.Използване на конструкции за управление - условни изрази

Използване на конструкции за управление – условни изрази и цикли
The most important to consider when organizing code is ordering dependencies
Wrong:
GetData();
GroupData();
Print();

Correct:
data = GetData();
groupedData = GroupData(data);
PrintGroupedData(groupedData);

Always put the normal (expected) condition first after the if clause
Wrong:
var response = GetHttpWebResponse();
if (response.Code == Code.NotFound)
{
    // ...
}
else
{
    if (response.Code == Code.OK)
    {
        // ...
    }
}

Correct:
var response = GetHttpWebResponse();
if (response.Code == Code.OK)
{
    // ...
}
else
{
    if (response.Code == Code.NotFound)
    {
        // ...
    }
}

Avoid comparing to true or false
Wrong:
if (HasErrors == true)
{
  ...
}
Correct:
if (HasErrors)
{
  ...
}
Start from the most common cases and then go to the more uncommon ones

Avoid double negation:
Wrong:
if (!HasNoError)
{
    DoSomething();
}
Correct:
if (HasErrors)
{
    DoSometing();
}

Do not use complex if conditions
	You can always simplify them by introducing boolean variables or boolean methods
Wrong:
if (x > 0 && y > 0 && x < Width-1 && y < Height-1 &&
    matrix[x, y] == 0 && matrix[x-1, y] == 0 &&
    matrix[x+1, y] == 0 && matrix[x, y-1] == 0 &&
    matrix[x, y+1] == 0 && !visited[x, y])
the code above can be refactored in this way:
bool inRange = x > 0 && y > 0 && x < Width-1 && y < Height-1;
if (inRange)
{
    bool emptyCellAndNeighbours =
        matrix[x, y] == 0 && matrix[x-1, y] == 0 &&
        matrix[x+1, y] == 0 && matrix[x, y-1] == 0 &&
        matrix[x, y+1] == 0;
    if (emptyCellAndNeighbours && !visited[x, y]) …
}

Write numeric boolean expressions as they are presented on a number line:


-------|---------|------------|---------
	   a	     x	     	  b
correct:
if(a < x && x < b) { … }

for loops
-	Use meaningful variable names
Correct:
for (int year =2000; year < 2015; year++) { … }

Avoid code that depends on the loop’s last index

Добре е циклите да са кратки. За да бъдат кратки е добре да отделяме по-големите парчета код в отделни методи