A value that is calculated by calling a JavaScript function. Note that the result is cached and this function will be called only once between any clears for its scope in the context.
function to call.
a way to represent this value in toString() call.
A value that is calculated by calling a JavaScript function. Note that the result is cached and this function will be called only once between any clears for its scope in the context.
Param: fn
function to call.
Param: str
a way to represent this value in toString() call.