ToString() method by default

[nerobotParticipant]

Hi Mark. Is it possible to add “default” ToString() method like in Java or C#?

Need to add this method to base Object class, so that it will be available in all classes.

Default ToString() will return class type and memory hash like “mojo.app.View@433463″.

And need to compiler call it itself when using “+” operator with strings – to avoid unwanted typing of Cast<String>(myObj).

 

And I saw that Bool type does not cast to string automatically, like Int.

Monkey

Local b := True Print "b: "+b ' Error: Value cannot be implicitly cast from type 'bool' to type 'string'

1 2 3 4

Local b := True Print "b: "+b   ' Error: Value cannot be implicitly cast from type 'bool' to type 'string'

and we need to write Cast<String>(b) – unwanted thing.

[JesseParticipant]

you don’t need to use cast for primitives. you can do this:

Monkey

[crayon-5cb9d0d77f3b0231009781 inline="true" ]Local b := True Print "b: "+String(b)

1 2 3

[crayon-5cb9d0d77f3b0231009781 inline="true" ]Local b := True Print "b: "+String(b)

[/crayon]

[nerobotParticipant]

I want to write just

Print “b: “+b

[JesseParticipant]

the only thing that doesn’t work that way is Bool. Integers, Floats and shorts work. I thin Mark needs to fix that.

[ArjailerParticipant]

Bool worked that way in v1.03

I’ve just switched from 1.03 to 1.05 and String(booleanValue) worked in 1.03 but has stopped working in 1.05 (and presumably 1.04)

Cast<String>(booleanValue) isn’t working either  

[nerobotParticipant]

Oh.. so will use Int(boolVal) until better times.

[Mark SiblyKeymaster]

The problem with bool->string conversion is that since string->bool is true if string is non-empty (which IMO is the right way to do it), then for Bool(String(Bool)) to produce the correct result (ie: should give same value as the original bool) bool->string needs to produce “” for false. Which means Print Bool( blah ) could print ‘nothing’ which I’m not comfortable with.

Or…if bool->string produced “true”/”false” or something, then Bool(String(Bool)) would always return true!

I have never really come up with a good solution for this (mx1 did it too) but I DO know I much prefer the simple ‘non-empty-string-is-true’ string->bool conversion as it’s easy to remember and IMO more useful in practice, than attempting to parse “1” or “true” or “True” etc as true.

[dmazParticipant]

The problem with bool->string conversion is that since string->bool is true if string is non-empty (which IMO is the right way to do it), then for Bool(String(Bool)) to produce the correct result (ie: should give same value as the original bool) bool->string needs to produce “” for false.

we don’t expect the original start value when going from a double to int and back. I think it’s a mistake to compare them to primitive number types. It’s pretty standard for string conversion of bool to produce ‘true’ / ‘false’.

[nerobotParticipant]

We not expected to convert string->bool like

Local b := “true” (1)    or    b := Bool(string) (2)

For this case other langs usually have Bool.Parse() func with different params.

However, for monkey case (2) also looks like good.

In mx2 it would be great to override To:String operator for Bool and return ‘true’/’false’.

But for IF’s str->bool conversions we expect use of rule “null or empty-string is false”.

[Author]

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