Conditional calculation

Question
1

Hello everybody, I am trying to apply a calculation based on a value from a column, by example
Ap01:
Item unit Qtyinunit
xxxx TS 2
xxx1 EA 1000
…

The calculation that I need to do is:
if unit = “TS”
then $(Qtyinunit)*1000
else $(Qtyinunit)*1

problem is, that in new column it appears the calculation as string (21000) or (10001) [not evaluated]

Ap02:
I had done in another way, but takes more transformations:
(column name: Qt01)
if unit = TS
then $(Qtyinunit)
else 0

(column name: Qt02)
if unit not equal TS
then $(Qtyinunit)
else 0

(column name: Qt001
calculate
Qt01 * 1000

(column name: QTF)
calculate
QT001 + Qt02

If the first approach, Ap01, had worked, simplicity was welcomed (I really do not understand why expression was not evaluated…)

Thanks in advance

Miguel

2

Hi Miguel

The If transform doesn’t accept an expression, just a value. So you just need 2 steps to make this work.

image
image1668×346 53.5 KB

image
image678×902 103 KB

image
image1086×730 124 KB

Or you could do it in one transform using the Javascript transform.

2 Likes
3

Thanks, it works for me (it is shorter that second approach!),

Regards,

Miguel

1 Like
4

About JavaScript, I had tried to code a solution, but my knowledge in the language is limited (I used to be a Pascal coder, Basic, and FORTRAN [yes, long time ago]). Could you recommend me a good tutorial in JavaScript just to use to extend some transformations, please?

5

Hi,

The simplest is done by using the JavaScript transform as follows

image

Hope this helps

1 Like
6

This is the Javascript equivalent:

image
image812×1116 129 KB

The documentation has some examples:

And there are loads of resouces online for learning Javascript. For example:JavaScript Tutorial

But I would recommend sticking with Easy Data Transform standard transforms where possible and only using JS if there is no other way to do it.

7

Thanks! I am eager to apply JavaScript!

8

Yes, I know that using JavaScript have some performance issues

9

The Javascript transform is still plenty fast enough for most purposes. Also if you can replace several transforms with 1 Javascript transform, then less memory is required. But I would still other ‘native’ transforms where possible.