Double Tap a keyboard button

I'm using Unity C# to implement a prototype game.

I have the basic movements, such as walk, run, and jump in all directions.

However, I'm finding it hard to implement a function where the player must double tap in order to dodge/dash.

Code (CSharp):

1.             if(Input.GetButton("Vertical")){
2.                 if(Input.GetButton("Run")){
3.                     Run();
4.                     moveDirection*=runMultiplier;
5.                 }
6.                 else{
7.                     Walk();
8.                 }
9.             }
10.             else if(Input.GetButton("Horizontal")){
11.                     Strafe(); //move sideways
12.                    
13.             }
14.             else{
15.                 Idle();
16.             }

Below the Strafe function, I want to check if the player double taps the button. If they do, then change their moveDirection to something higher.

I've tried searching online, but I only have found implementation of buttons being held. For example, WW to run, like in shooters.

Would appreciate any positive directions to this approach. Thank you.

 

Use a timer to keep track of time between key presses. If it meets a certain criteria do stuff.

 

This is an example of how to implement a timer for it like Polymorphik suggested: http://aidtech-game.com/double-tap-button-unity3d/#.VOPjffmUd8E

 

Thank you, I will check this out.