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introduction to touchdevelop action properties o either select entire action and tap edit o or select properties at the bottom

introduction to touchdevelop name, private o multiple pages of properties o change name o toggle private (private actions cannot be called directly by the end- user, but only by other actions

introduction to touchdevelop parameters o remove parameter o add parameter change name change type

introduction to touchdevelop returns o just like parameters o multiple return values possible o assign each in action, just like local variables o it is an error if there is a path where return value is not assigned

introduction to touchdevelop initial values o parameters get initial value from calling context o returns are initially ‘invalid’

introduction to touchdevelop running o from script editor, you can directly run non-private actions if they have no type-checking errors if action requires parameters, a user-interface will be generated to input values If action returns value, it is posted to the wall when action returns

introduction to touchdevelop exercise ► implement the following recursive functions: factorial sum of … + N product of 1 * 2 * … * N

introduction to touchdevelop title o item 1 o Item 2 song→post to wall ☀ anecdote ☁ (link to sample) ► an exercise ✿ a reference