Variable types, string vs number

Question

Josh Tennefoss · Dec 9, 2016

Is there any way that I can check the native type of an object script variable? (similar to the typeof check in javascript)

I see that the DynamicArray class uses the type of the variable for its output, I would like to do something similar when I receive a value as an argument to my method.

USER>s var1 = 123 //No quotes, number type

USER>s var2 = "123" //quotes, string type

//DynamicArray can tell the difference
USER>s arr = []

USER>d arr.%Push(var1)

USER>d arr.%Push(var2)

USER>w arr.%ToJSON()
[123,"123"] //first value is output without quotes, second value is quoted

Discussion (3)0

Eugene Karataev · Dec 9, 2016

Yes, no problem:

USER>w $a($lb(123),2)
4
USER>w $a($lb("123"),2)
1
USER>w $a($lb(-123),2)
5
USER>w $a($lb(123.0),2)
6
USER>w $a($lb(-123.0),2)
7

0 0

Timothy Leavitt · Dec 9, 2016

One way to do this is comparing $listbuilds of the variable in question. Note also that you can coerce any value to a number with the "+" operator. So, for example:

USER>set var = 1
 
USER>w $lb(var)=$lb(+var)
1  <-- var is a number.
USER>set var = "1"
 
USER>w $lb(var)=$lb(+var)
0  <-- var is a not a number.

There's not really a simple built-in function to do exactly what you want though (at least that I know of).

3 0

Sean Spencer · Dec 12, 2016

You can do something like this. It may not be perfect for your situation but it works.

set value = 1
If value'?.N{
     // if it's not a number do something here
     }
if value?.N{
    //if it's a number do something else here.
}

0 0