The following table is a set of statements and functions for the script.

Type	Description
`if`…`else` Statement	The `if` statement executes the instruction code when the condition is true. Otherwise, the `else` statement will execute its instruction code. `if`...`else` statements can be nested inside another `if`...`else` statement using the `else if` statement which creates a nested loop. Please note, there is no limitation on how many `else if` can be nested inside `if`...`else` statement.
`while` Statement	The `while` statement execution will continue until the expression becomes `false`.
`do`…`while` Statement	The `do` statement is executed at least once before `while` condition is evaluated. The loop will repeat until `while` condition becomes `false`.
`for` Statement	A `for` loop repeats until a specified condition becomes `false`. Below is the standard syntax used by a `for` loop: for ([initialExpression]; [conditionExpression]; [incrementExpression]) { // instruction code }
`switch`…`case` Statement	Only one default statement can be used in the `switch` statement. The `switch` expression is evaluated once by comparing the expression value with the values of each `case`. If matched, the associated instruction code is executed. Otherwise, `default` instruction code is executed. Additionally, `case` statement must be followed by a constant value and terminated with a colon. Tags, variables, or expressions cannot be used in a `case` statement.
`break` Statement	Terminates a `switch` or a loop completely. The `break` statement prevents the execution of the following `case` in the `switch` statement. Adding a `break` function to the last `case` is good practice. If `return` is present, `break` statement is not necessary.
`function` Keyword	A block of code designed to perform a particular task and will only executes when something calls it.
`return` Statement	Ends function execution and the function caller will return specifies a value.
`default` Statement	The `default` statement is optional and does not need a constant. `break` statement is not needed either. This statement will execute if no cases get executed.
`continue` Statement	The `continue` statement terminates execution of the current iteration in a loop and then execute the next iteration in a loop. This statement does not terminate the loop completely.
`system.runScript()` Function	When an external program is called directly, the caller will be in standby mode until the called program (the external program) ends its operation. However, if an external program is called using `runScript()`, the caller will not wait until the end of the called program. Both the caller and called program will be executed in parallel.

Example for `if`…`else`:

In this example, if tag A equals 1, assign 100 to A. Otherwise, assign 500 to A.

if (tag.read("A") == 1) {
    tag.write("A", 100.0);
} else {
    tag.write("A", 500);
}

Example for `while`:

The tag "A_WHILE" value will consistently be read and written to the variable val in this example. If the value in the variable val is less than 500, keep incrementing by 1 and store the incremented value to the tag "A_WHILE" in each loop. Once the variable val equals 500, end the loop and exit the script.

var val = tag.read("A_WHILE");
while (val < 500) {
	val = val + 1;
	tag.write("A_WHILE", val)
	thread.msleep(10)
}

Example for `do`...`while`:

The tag "DO_VAL" value will consistently be read and written to the variable do_val in this example. The do loop will increment by 1 and store the value into the tag “DO_VAL” before executing the while loop. Once the variable do_val equals 200, the while loop will terminate, but the do statement will stay executable allowing a user to increment by 1 manually.

var do_val = tag.read("DO_VAL");
do {
    do_val = do_val + 1;
    tag.write("DO_VAL", do_val)
    thread.msleep(100)
} while (do_val < 200);

Example for `for`

In this example, the initial expression is 0. When i is less than or equal to 100, i will increment by 1 and store the result in A every execution until i equals 100. Once i equals 100, the for loop will end.

var i = tag.read("FOR_VAL");
for (i = 0; i <= 100; i = i + 1) {
	tag.write("FOR_VAL", i)
	thread.msleep(100)
}

Example for `switch`…`case`…`break`

The tag "PET" value will consistently be read and written to the variable pet in this example. The switch will start matching the values between the variable pet and the tag "PET." If the case matches, the expression in the case will execute accordingly. When finished, the break statement will terminate the switch or loop altogether.

var pet = tag.read("PET")
switch (pet) {
    case "cat":
        tag.write("CASE_STR", "I love cats too!");
        break;
    case "dog":
        tag.write("CASE_STR", "I love dogs too!");
        break;
}

Example for `return`

In this example, the function keyword calls the values in myFunction to perform multiplication and store the results to the tag "RETURN_ONE." The return statement then outputs the value in the tag "RETURN_ONE."

function myFunction(a, b) {
	a = a * b;
	tag.write("RETURN_ONE", a);
	return tag.read("RETURN_ONE");
}
var x = myFunction(4, 3);

Example for `default`

In this example, when the script executes, the tag "REPLY" will be assigned the string value "Hello, my name is CIMON. What is your name?" by default. If the user enters their name, the "NAME" string tag will store their name. If the name entered is "Christian," the "Hi Christian!" will update the "REPLY" string tag.

var name = tag.read("NAME")
switch (name) {
    case "Christian":
        tag.write("REPLY", "Hi Christian!")
        break;
    default:
        tag.write("REPLY", "Hello, my name is CIMON. What is your name?");
}

Example for `continue`

The tag "TIMER" value will consistently be read and written to the variable timer in this example. When the value in the variable timer is less than 5000 and 10,000, the value in the variable timer will be incremented by 101 each loop until it reaches 5000. When the value in the variable timer reached 5000, the value in the variable timer will be incremented by 1 instead. Once the value in the variable timer reaches 10,000, the while loop will be terminated.

var timer = tag.read("TIMER");
while (timer < 10000) {
    timer = timer + 1;
    tag.write("TIMER", timer);
    thread.msleep(100)
    if (timer < 5000) {
        timer = timer + 100;
        tag.write("TIMER", timer);
        continue;
        thread.msleep(100)
    }
}

Example for `system.runScript()`

In this example, the system.runScript function will call and executes the script name “WHILE_Script.”

system.runScript("WHILE_Script")

13.1.5 Statements, Command Expressions, and Conditions

Example for if…else:

Example for while:

Example for do...while:

Example for for

Example for switch…case…break

Example for return

Example for default

Example for continue

Example for system.runScript()