Function class

Function : The function object

 

Constructors

• (string functionName) - Create a new function that will reuse an existing function.

 Methods

• AnyType Call(Params AnyType) - Evaluate a function with positional parameters.
• AnyType Invoke(array parameter) - Evaluate a function with positional parameters.
• AnyType Invoke(Dictionary parameter) - Evaluate a function with named parameters.
• string ToString() - The string representation of the object.

 Properties

• string ObjectTypeName HasGetter  - The name of the type of object.
• TypeInformation TypeInformation HasGetter  - Get information about this class.

 

Scoping of variables

Ex1:

function a = function ()

{

   number b = 1;

   return true;

};

print(b);                            // Not work, get error: Undefined variable name: 'b'. @

Ex2:

number i = 10;

function a = function () {

  print(i);

  print(b);

};

number b = 20;

a.Call();                            // 10 20

Ex3:

number i = 10;

function a = function () {

  print(i);

  print(b);

};

a.Call();                           // Not work, get error: Undefined variable name: 'b'. @

number b = 20;

Ex4:

number i = 10;

function a = function (number i) {

  print(i);

};

a.Call(100);                    // 100

print(i);                          // 10

Ex5:

number i = 10;

function a = function () {

  number i = 100;

  print(i);

};

a.Call();                           // Not work, get error:  Illegal variable re-declaration @

 

Recursion

Ex1:

function a = function (number i)

{

 if (i == 0) return;

 a.Call(i - 1);

 return i;

};

a.Call(49);                         // Return 49

Ex2:

function a = function (number i)

{

 if (i == 0) return;

 a.Call(i - 1);

 return i;

};

a.Call(50);                        // get error because the maximum limit of recursion is: 49

 

Examples

function x = function (number a, number b, number c = 10)

{

   number d = 1;

   return a + b + c + d + p;

};

number p = 10;

 

print(x.Call(1,2));

print(x.Call(1,2,3));

 

function y = x;

print(y.Call(1,2));

print(y.Call(1,2,3));

 

function z = new Function("x");                            // remmember that new Function("x") NOT new function("x")

print(z.Call(1,2));

print(z.Call(1,2,3));

 

function f;                                                         // will be empty

Function ff;                                                       //  get error because there is no default constructor

 

array paraArray_a = {1,2};

array paraArray_b = {1,2,3};

print(x.Invoke(paraArray_a));

print(x.Invoke(paraArray_b));

 

Dictionary dic1 = {"a": 1,"b": 2};

print(x.Invoke(dic1));                                     // 24

 

Dictionary dic2 = {"a": 1,"b": 2,"c": 3};

print(x.Invoke(dic2));                                     // 17

 

Dictionary dic3 = {"c": 3,"a": 1,"b": 2};

print(x.Invoke(dic3));                                     // 17

 

Dictionary dic = {"para_1": 1,"para_2": 2,"para_3": 3};

print(x.Invoke(dic));            //    will cause error because the keys in dictionary not the same as name of parameters which is defined in function x

 

Send function to Called Workflow

Ex1:

// IN FIRST WORKFLOW

function x = function (number a, number b) {

return a + b;

};

Workflow_call(37248984, {x});

//  IN SECOND (CALLED) WORKFLOW (Resource Id: 37248984)

array Workflow_parameters = Workflow_getParameters();

return Workflow_parameters[0].Call(1,2);

// ------get result: 3---------

Ex2:

// IN FIRST WORKFLOW

number i = 10;

function x = function (number a, number b) {

return a + b + i;

};

Workflow_call(37248984, {x});

// IN SECOND (CALLED) WORKFLOW (Resource Id: 37248984)

array Workflow_parameters = Workflow_getParameters();

return Workflow_parameters[0].Call(1,2);

// ------get result: 13---------