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

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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 @

 

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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---------