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Narin Maneekhat (Unlicensed)

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The following table is a set of statements and keywords that can be used in 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:

Code Block
languagejs
for ([initialExpression]; [conditionExpression]; [incrementExpression]) {
    // instruction code
}

switch…case 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.

break Statement

Terminates a switch or a loop. The break statement prevents the execution of the following case in the switch statement. Adding a break statement to the last case is good practice.

continue Statement

Terminates execution of the current iteration in a loop and then execute the next iteration in a loop.

break Statement

Terminates the execution of a loop entirely.

return Function

Ends function execution and the function caller will return specifies a value.

runScript() Function

runScript() is used to call another script program. For example, if runScript() is being used in script name "A" to call a script name "B", as soon as script A executes, script B will execute as well.

Example for if…else:

In this example, if A equals 1, assign 5 to A. If A equals 2, assign 10 to A. If A does not equal 1 or 2, assign 0 to A.

Code Block
languagejs
A = 1;
if (A == 1) {
    A = 5;
} else if (A == 2) {
    A = 10;
} else {
    A = 0;
}

Example forwhile:

In this example, 0 is set as the initial value for variable A. When A is less than 10, A will increment by 1 every execution until A equals 10. Once A equals 10, the while loop will end.

Code Block
languagejs
A = 0;
while (A < 10) {
    A = A + 1;
}

Example for do...while:

In this example, 0 is set as the initial value for variable A. The do statement will first be executed, incrementing A by 1 every execution until equal to 10. Once A equals 10, the do...while loop will end.

Code Block
languagejs
A = 0;
do {
    A = A + 1;
} while (A < 10);

Example for for

In this example, the initial expression is 1. When i is less than 11, i will increment by 1 and store the result in A every execution until i equals 11. Once i equals 11, the for loop will end.

Code Block
languagejs
for (i = 1; i < 11; i = i + 1) {
    A = i;
}

Example for switch…case

This statement is used when different processes are needed for different cases. Each case can be distinguished by an unlimited number of case statements.

...

The BREAK keyword plays the role of terminating the SWITCH statement. If there is no BREAK keyword after a CASE statement, then corresponding CASE/DEFAULT statements will also be executed. This means that multiple CASEs can execute the same result, as shown in the example below.

Code Block
languagejs
pet = "dog";
switch (pet) {
    case "cat":
        A = 1;
        break;
    case "dog":
        A = 2;
        break;
    case "hamster":
        A = 3;
        break;
}

Switch (A)

{

Case 1:

// Write the program when A is 1.

Break;

Case 5:

Case 7:

// Write the program when A is 5 or 7.

Break;

Default:

// Write the default program. This section can be omitted.

Break;

}

...