Many times I need to loop over all the items of an array. If it was List I would have used ForEach extension method.
Do we have anything similar for arrays as well.
For. e.g. lets say I want to declare an array of bool of size 128 & initialize all members to true.
bool[] buffer = new bool [128];
There can be many more use cases
Now initialize it to true. is there any extension method or do I need to write traditional foreach loop??
You could use this to initialize the array:
bool[] buffer = Enumerable.Repeat(true, 128).ToArray();
But in general, no. I wouldn't use Linq for writing arbitrary loops, only for querying the data (after all, it's called Language-Integrated Query).
You could create an extension method to initialize an array, for example:
public static void InitAll<T>(this T[] array, T value)
{
for (int i = 0; i < array.Length; i++)
{
array[i] = value;
}
}
and use it as follows:
bool[] buffer = new bool[128];
buffer.InitAll(true);
Edit:
To address any concerns that this isn't useful for reference types, it's a simple matter to extend this concept. For example, you could add an overload
public static void InitAll<T>(this T[] array, Func<int, T> initializer)
{
for (int i = 0; i < array.Length; i++)
{
array[i] = initializer.Invoke(i);
}
}
Foo[] foos = new Foo[5];
foos.InitAll(_ => new Foo());
//or
foos.InitAll(i => new Foo(i));
This will create 5 new instances of Foo and assign them to the foos array.
You can do that not to assign a value but to use it.
bool[] buffer = new bool[128];
bool c = true;
foreach (var b in buffer)
{
c = c && b;
}
Or using Linq:
bool[] buffer = new bool[128];
bool c = buffer.Aggregate(true, (current, b) => current && b);
foreach loops, but is wondering if there's another way. Also your Linq example could be simplified to buffer.All(b => b)