How to take care that the + before a number is ignored

Thinking about this functionally, you want

   to sum

   the array elements that are not + .

So,

   (array select: [:each | each ~~ #+]) sum

The *best* approach is not to put the + symbols

into the array in the first place.

On Sun, 2 Dec 2018 at 23:46, Roelof Wobben <[hidden email]> wrote:

Op 2-12-2018 om 11:15 schreef Hilaire:
> #(+1 -8) inject: 0 into: [:sum :each | each ~= #+ ifTrue: [sum +  each]
> ifFalse: [sum]] .

Thanks,

Now to stretch my mind I will try to make one with double-dispatch.

Roelof

Thinking about this functionally, you want

   to sum

   the array elements that are not + .

So,

   (array select: [:each | each ~~ #+]) sum

The *best* approach is not to put the + symbols

into the array in the first place.

On Sun, 2 Dec 2018 at 23:46, Roelof Wobben <[hidden email]> wrote:

Op 2-12-2018 om 11:15 schreef Hilaire:
> #(+1 -8) inject: 0 into: [:sum :each | each ~= #+ ifTrue: [sum +  each]
> ifFalse: [sum]] .

Thanks,

Now to stretch my mind I will try to make one with double-dispatch.

Roelof

Who said anything about deleting any numbers?  The code

fragment I posted did not delete any numbers; it merely

made a new array with everything that was not #+.  In

the original post there were no strings.  (By the way,

you wrote "trailing" where you meant "leading".)

On Mon, 3 Dec 2018 at 08:40, Roelof Wobben <[hidden email]> wrote:

and I do not want to delete all numbers that begin with a + but remove the trailing +  from a string which look like this +15

Op 2-12-2018 om 20:36 schreef Richard O'Keefe:

Thinking about this functionally, you want

   to sum

   the array elements that are not + .

So,

   (array select: [:each | each ~~ #+]) sum

The *best* approach is not to put the + symbols

into the array in the first place.

On Sun, 2 Dec 2018 at 23:46, Roelof Wobben <[hidden email]> wrote:

Op 2-12-2018 om 11:15 schreef Hilaire:
> #(+1 -8) inject: 0 into: [:sum :each | each ~= #+ ifTrue: [sum +  each]
> ifFalse: [sum]] .

Thanks,

Now to stretch my mind I will try to make one with double-dispatch.

Roelof