Abstraction

Abstraction is the process of defining general format for different methods in a program.

For example if we consider the following program that applies the square twice on a given number, we can create an abstraction for that function in the described manner compare to creating a method which apply the same function twice on a given number.

        
          function square(n) {
            return n * n;
          }
          
          function applySquareTwice(n) {
            return square(square(n));
          }
          
          applySquareTwice(2); // 16
          
          // Abstracted Function
          
          function applyTwice(n, f) {
            return f(f(n));
          }
          
          applyTwice(2, square); // 16