Function and Sub Procedures: Difference between revisions
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Procedures are blocks of program statements that can be conditionally and repeatedly executed ("called") from other statements in a program, with optional values (arguments) passed in. When a procedure is called, it behaves like the Functions and Statements that make up the | Procedures are blocks of program statements that can be conditionally and repeatedly executed ("called") from other statements in a program, with optional values (arguments) passed in. When a procedure is called, it behaves like the Functions and Statements that make up the NSB/App Studio language. FUNCTION procedures return a value, which can be stored in a variable or used in another expression. SUB procedures execute without returning a value. If a FUNCTION procedure is called and the return value is not used, NSB/App Studio executes it as a SUB procedure. | ||
To pass in multiple arguments to a FUNCTION procedure, use a comma-separated list, enclosed in parenthesis. To pass in multiple arguments to a SUB procedure, use a comma-separated list with no parenthesis. When a single argument is passed in to either a FUNCTION or a SUB procedure, parenthesis may be used; NS Basic/App Studio uses parenthesis around a single argument to evaluate an expression, not to denote an argument list. | To pass in multiple arguments to a FUNCTION procedure, use a comma-separated list, enclosed in parenthesis. To pass in multiple arguments to a SUB procedure, use a comma-separated list with no parenthesis. When a single argument is passed in to either a FUNCTION or a SUB procedure, parenthesis may be used; NS Basic/App Studio uses parenthesis around a single argument to evaluate an expression, not to denote an argument list. | ||
Arguments are passed by value for numbers, strings and arrays. Objects are passed by reference. | Arguments are passed by value for numbers, strings and arrays. Objects are passed by reference. | ||
Revision as of 13:01, 2 September 2012
Procedures are blocks of program statements that can be conditionally and repeatedly executed ("called") from other statements in a program, with optional values (arguments) passed in. When a procedure is called, it behaves like the Functions and Statements that make up the NSB/App Studio language. FUNCTION procedures return a value, which can be stored in a variable or used in another expression. SUB procedures execute without returning a value. If a FUNCTION procedure is called and the return value is not used, NSB/App Studio executes it as a SUB procedure.
To pass in multiple arguments to a FUNCTION procedure, use a comma-separated list, enclosed in parenthesis. To pass in multiple arguments to a SUB procedure, use a comma-separated list with no parenthesis. When a single argument is passed in to either a FUNCTION or a SUB procedure, parenthesis may be used; NS Basic/App Studio uses parenthesis around a single argument to evaluate an expression, not to denote an argument list.
Arguments are passed by value for numbers, strings and arrays. Objects are passed by reference.