Erlang -- tuples

(1) Operation of tuples in Erlang:

1. Concepts of tuples:

1. Fixed Number

2. Any types that Erlang can recognize

2. Create a tuples:

1. f = {A, XX, 123, {345, BB, CC, "XX "}}.

3. Extract tuples

1. Matching:

Eg:

F = {A, XX, 123 },

{A, XX, YY} = f. % the value of YY is 123.

2. Erlang: element (Pos, mytuple). Pos indicates the first element, starting from number 1.

4. Length of the tuples:

1. Erlang: length (mytuple ).

(2) Others:

1. because the number of tuples is fixed, no addition or deletion operations exist.

2. We recommend that you use an atom to represent the first item of the tuples:

Eg:

Len = {lenght, 10}. % indicates that the length is 10

Erlang -- tuples