Var and Let

Jacques TUR

Both var and let can be used to declare a variable. Unlike in JavaScript, there is no difference in scope between let and var in Ninox.

The type of the variable depends on the type of value assigned to it:

var t := "my text";

var b := false;

var n := 10;

A variable can be declared multiple times within the same code. In such cases, the variable will retain the type and value assigned to it until the new declaration is reached:

var b := true;

dialog("Message 1", "Value of b: " + b, ["ok"]);

var b := 12;

dialog("Message 2", "Value of b: " + b, ["ok"]);

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Confusion Between Variable Names and Table/Field IDs

Ninox saves its code in a slightly different format than what is displayed on the screen. Specifically, field and table names are replaced with their IDs, which are letters.

For example, the following script, which calculates the sum of sold items:

sum('Invoice Items'.Total)

Will be saved in the system code as follows, where D is the ID of the table 'Invoice Items' and E is the ID of the field Total:

sum(D.E)

In this context, if a variable D is created, it can cause confusion for the compiler, as the following system code would make it unclear whether D.E refers to a table or the previously declared variable D:

(var D := "hello"; sum(D.E))

To avoid such confusion, variables should be given names that are unlikely to match table or field IDs, or table/field names. This is why variables are often named with short, lowercase names (e.g., a, b, or c) to prevent them from being confused with IDs.

Confusion Between Variable Names and Table/Field IDs

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