JavaScript is an object oriented scripting programming language. Its syntax belongs to the
C/C++/Java famiy. However there is no connection with the
Java language (except for the similar syntax).
JavaScript is a high level language that supports many constructions valued by programmers (a set of own functions and methods, dynamic objects, first-class functions, prototyping, regular expressions, inheritance etc.).
The designer is
not forced to use these higher functions (it is even not recommended to use them) because only the basic knowledge of the language syntax is needed for application design (see
JavaScript statements,
The JavaScript operators,
Data types JavaScript).
This way the language becomes
very simple to use, even simpler than the
VBScript language - see
Comparison of the VBScript and JavaScript languages.
The PROMOTIC system
does not even use the embedded objects of the JavaScript language and replaces them by its own objects.
The
JavaScript objects are listed below:
-
String: This
JavaScript object has many methods for working with text strings.
But the PROMOTIC system uses the
String data type, which is a primitive data type, not an object.
For working with this type the
Pm string methods can, for example, be used.
- Number: This JavaScript object represents all numeric values (Byte, Integer, Long, Single, Double).
But the PROMOTIC system uses the primitive data types instead.
- Boolean: This JavaScript object represents Boolean value.
But the PROMOTIC system uses the primitive data types instead.
-
Date:
This
JavaScript object has many methods for working with date and time.
The internal value of this object is of the
Double type and it is represented by a number of miliseconds since
1.1.1970 - tuto hodnotu lze získat Javascript metodou
Date.getTime().
The PROMOTIC system stores date and time into the value of the
Double type (it is a number of days since
30.12.1899 - the same way as
Date data type of the
VBScript language).
The values can be converted between Javascript and PROMOTIC (of the
Double type) by the
Pm.GetDateOf(1, tDate, 0, 4).
The
Pm.CreatePmDateObject method can be used to transform the values of the
Double type into a
PmDateObject object. This object has its own methods for working with date and time (read and write hour, day, month, etc.).
See also:
Pm date and time methods.
-
Array: This
JavaScript object represents 1-dimensional array.
The PROMOTIC system uses the
Array data type instead, that corresponds to the
JavaScript language
PmArray object.
Contrary to the JavaScript object, the
PmArray object can be 1-dimensional or 2-dimensional and all the features of this object are adapted to the needs of the PROMOTIC system.
See also:
How to use array of values in the PROMOTIC system.
- Object: This JavaScript object represents the basic object. The PROMOTIC system does not need such object.