how to use 2 functions at once in delphi?

Question

OK, so here is what i mean since i couldnt think of a better title, I have 2 editbox's. 1 is for input of a string and the other is for the output.

ive been experimenting with edit2.text := LowerCase (edit1.text); & edit2.text := ReverseString (edit1.text);

i want to use the functions LowerCase & ReverseString at the same time so it both converts the capitals string to lowercase and reverses it also.. i just cant figure out how to do this without throwing all kinds of compiler errors, can anyone help me out

Forget & as anything except a way to provide a shortcut to a button or menu item in the Caption in Delphi. There's only one way to use it as an operator, and chances of you needing that one way are small. The equivalent of VB's & operator in Delphi is and for binary and logical comparisons and + for string concatenation (Result := 'abc' + def';`. — Ken White
– Ken White, Commented Jun 1, 2013 at 0:36
I hold my down-vote because it's such a common thing to do in any programming language. Not understanding why anyone would have up-voted this. I haven't written a single project yet that didn't do this. — Jerry Dodge
– Jerry Dodge, Commented Jun 1, 2013 at 17:18
@JerryDodge - I believe this question would be beneficial to anyone searching for this that doesn't know as they would end up here. He didn't know and that is why he asked! I am upvoting just to cancel out your down vote. — Shambhala
– Shambhala, Commented Jun 1, 2013 at 19:54

Andreas Rejbrand · Accepted Answer · 2013-05-31 23:23:38Z

10

You should do

Edit2.Text := ReverseString(LowerCase(Edit1.Text));

Alternatively, since these functions commute, you can do

Edit2.Text := LowerCase(ReverseString(Edit1.Text));

answered May 31, 2013 at 23:23

Andreas Rejbrand

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2 Comments

Sheep Over a year ago

Thank you.. that is exactly what i needed! Yes, what do you call it when you do that? when you use ( ( )) ??

Andreas Rejbrand Over a year ago

@Sheep: Function composition (but it's so 'obvious' you never talk about it, really). If f and g are functions that take a string and return a string, then f('test') is a string [because f returns a string], just as 'test' is! Hence, just as you can compute g('test'), you can compute g(f('test')).

flaschenpost · Accepted Answer · 2013-05-31 23:23:53Z

4

How about edit2.text := LowerCase(ReverseString(edit1.text)) ?

answered May 31, 2013 at 23:23

flaschenpost

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1 Comment

Sheep Over a year ago

Yes, what do you call it when you do that? when you use ( ( )) ??

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