B4P Reference

Function Names

identify

Description

Identifies the variable form (existence of structure or array). If the variable does not exist, then "not found" will be returned.

Call as: function

Restrictions

Indirect parameter passing is disabled

Parameter count

Parameters

No.	Type	Description
1 code	variable :string	Variable to check

Return value

Type

Description

string

variable form

One of the following:

not found	Variable does not exist
simple	Simple variable (contains no members)
structure	Variable contains named members
array	Variable contains array members
zero members	A variable which contained members but have been deleted or originates from a loaded JSON file with zero-element array read in.

Examples

  a[] = 1;

  b[a] = 2;

  dim(c[], 1, 3);



  echo( identify(a[]));     // Returns simple

  echo( identify(b[]));     // Returns structure

  echo( identify(b[a]));    // Returns simple

  echo( identify(c[]));     // Returns array

  echo( identify(d[]));     // Returns not found

  delete( b[a] );

  echo( identify(b[]));     // Returns zero members

Output

simple
structure
simple
array
not found
zero members

Try it yourself: Open LIB_Function_identify.b4p in B4P_Examples.zip. Decompress before use.

identify

Function Names

Description

Call as: function

Restrictions

Parameter count

Parameters

Return value

Examples

Output

See also