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Custom function App Designer [Matlab] [App Designer]

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Robin L.
Robin L. 2019 年 3 月 14 日
編集済み: Robin L. 2019 年 3 月 14 日
Hello !
I made a discovery in App Designer : it seems like "app" is optional when using custom functions :
methods (Access = private)
function add(app, a, b) % get both parameters BUT also app before !
disp(a + b);
end
function startupFcn(app)
app.add(app, 5, 6); % print 11
app.add(5, 6); % let's send 2 parameters (without app) / print also 11
end
end
Am I right ?
Is it advisable to send "app" first ?
Robin

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Steven Lord
Steven Lord 2019 年 3 月 14 日
No, the app object is not optional. You must pass it into the method in order to invoke the method.
What you're seeing is one of the two ways to invoke a method, dot notation versus function notation. See the section "Dot Notation vs. Function Notation" on this documentation page for a description of the specific cases where those two approaches to invoking a method can differ. [You can also use this to dynamically call a method whose name is stored in a string or char variable, as described in the "Referencing Names with Expressions—Dynamic Reference" section on that same documentation page.]
When you use dot notation, the object before the dot is passed into the method as the first input.

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Robin L.
Robin L. 2019 年 3 月 14 日
Thank you so much Steven Lord ! ?
But which one is better ?
add(app, 5, 6);
app.add(5, 6);

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