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RelateScript
Outline full outline 
Overview 
Data Types 
Operators 
Order of Operations 
Assignment 
String Concatenation 
Arithmetic & Date/Time Operators 
Comparative Operators 
Logical Operators 
Casting Operators 
Increment and Decrement Operators 
The Conditional Operator 
Bitwise Operators 
Statements 
Functions 
Working with Relate Data 
Field Data 
Accessing Forms and Fields 
Accessing Fields 
Single Entry Forms 
Multi-Entry Forms 
Queries and Reports 
Searching 
Form Permissions 
Special Data and Functions 
How Formulas Work 
Types of Formulas 
The 8 Step Edit Process 
Writable or Read-Only? 
Field Formulas 
Related Topics 

String concatenation means combining two String values into one. This is done with the plus symbol as in this example: 
    "first" + "second"
You can also concatenate other types of data to a String, such as:
    "two + two = " + 4
When you do this, the number 4 is first converted to a String, "4", then concatenated to the original String. You can put the thing to be concatenated either before or after the String. For instance,
    3.1415 + " is the value of pi"

String concatenation is one of the few operations which does not result in null if one of the input values is null. The only way to get a null result is if both inputs are null. If only one input is null, the result is the other, non-null input.