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Writing function handlers
When you write a handler for a function, you specify statements that compute and return a value to the handler that calls the function. Each function handler has the following form, where the italicized words are placeholders:
HyperCard has many built-in functions, but you can also write your own:
The function square receives a number through its parameter variable, x. It then returns the value of x * x to the handler that called it (mouseUp) using the return keyword.
Related Topics
Placeholders
functionName
Any text string, without quotation marks, that represents the name of the function handler you want to write:
As in the HyperTalk examples:
statements
Any return-separated list of built-in commands, user-defined handlers, or keywords that are part of a message or function handler.
