Page Comparison

Standard form

Syntax

for(<init>; <condition>; <increment>){
   Instruction1;
   ...
   InstructionN;
}

Example

// Prints numbers from 0 to 9 in console
for (number i = 0; i < 10; i++) {
    runnerLog(i);
}

Example description

This example demonstrates a basic iteration:

• Initializes a counter i to 0.

• Continues looping while i is less than 10.

• Increments i by 1 in each iteration.

• Prints each number from 0 to 9 (total 10 numbers) in the SIL Manager output console.

The foreach

Foreach form

Syntax

for(<variable_definition> in <array>){
   Instruction1;
   ...
   InstructionN;
}

Example

for(string user in watchers){
   runnerLog(user);
}

Example description

This foreach loop iterates through a collection of watchers of a specific issue and prints the list of the watchers:

• Automatically iterates through each element in the watchers array.

• Assigns each element to the user variable in each iteration.

• Prints the name of each watcher in the SIL Manager output console.

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While statement 

The while statement provides support for conditional repetitive execution of a code block. It evaluates the condition first:

• If the condition is true, the instructions in the body (the loop) is executed.

• If the condition is false from the start, the loop body is never executed.

Syntax

while(condition) {
    Instruction1;
    ...                // Instructions when condition is true
    InstructionN;
}

Example

string [] multisel;
number i = 1;
while(i <= 3) {
    multisel += "value" + i;
    i++;
}

Example description

This while loop in this example demonstrates how to build a collection incrementally:

• Starts with i as 1.

• Continues looping while i is less than or equal to 3.

• In each iteration, adds a new element to multisel array

• Element is created by concatenating "value" with the current value of i.

• After completion, multisel will contain ["value1", "value2", "value"].

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Do-while statement

The do-while statement is similar to the while statement except that it guarantees at least one execution of its code block before evaluating the termination condition. Even if the condition is false, the instructions will still be evaluated once.

Syntax

Code Block
do { Instruction1; ... InstructionN; } while(condition);

Example

number i = 1;
string [] people;
do {
    people += watchers[i];
    i++;
} while(i < 5);

Example description

This example do-while loop populates a people array, ensuring at least one processing of the loop body:

• Starts with i as 1.

• Adds watchers to the people array from index 1.

• Increments i after each iteration.

• Continues until i is no longer less than 5.

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Switch statement

The switch statement provides a structured mechanism for conditional execution based on the value of a specific variable.

• It accepts both number and string variables.

• Evaluates the input variable against multiple predefined case values.

• Executes the first matching case's code block.

• Continues executing subsequent cases unless a break statement is used.

• Can support Supports specific handling for unmatched cases through the default branch.

Syntax

switch(variable) {
    case value1:
		Instruction11;
		...
		Instruction1N;	
	[break;] 
    case value2:
		Instruction21;
		...
		Instruction2N;
	[break;]
	...
	case valueN:
		InstructionM1;
		...
		InstructionMN;
	[break;]
	[default:
		InstructionDef1;
		...
		InstructionDefN;]
}

Note: 

Example 1: Switch with numbers (with break statements and default branch)

switch (priority) {    // priority is a number variable
    case 1:
        // Executes only when priority equals 1
        escalateImmediately();
        break;         // Prevents fallthrough to case 2
    case 2:
        // Executes only when priority equals 2
        scheduleReview();
        break;         // Prevents fallthrough to case 3
    case 3:
        // Executes only when priority equals 3
        addToBacklog();
        break;         // Prevents fallthrough to default
    default:
        // Executes when priority doesn't match 1, 2, or 3
        logInvalidPriority();
}

Example 2: Switch with string matching

switch (status) {      // status is a string variable
    case "ERROR":
        logError();    // No break - falls through to "WARN"
    case "WARN":
        sendAlert();
        break;         // Stops here for both "ERROR" and "WARN"
    case "INFO":
        logMessage();
        break;
    default:
        // Handles any status value not matching above cases
        logUnknownStatus();
}

Examples description

In both examples, cases are evaluated from top to bottom. Only equal values trigger case execution.

• The break statement terminates the switch block's execution after a case is handled, preventing unintended fallthrough to subsequent cases. The second example demonstrates an intentional fallthrough. For additional information about the break statement, refer to the Break Statementstatement section.

• The default branch functions as an essential catch-all mechanism within the switch statement. It executes when the input value doesn't match any of the defined case values, providing a way to handle unexpected or unspecified inputs. While optional, including a default branch is considered best practice as it ensures comprehensive handling of all possible input values and helps prevent undefined behavior.

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Break statement

The break statement serves two distinct control flow purposes:

• Loop termination: When used within loops (for, while, do-while), the break statement provides immediate termination of the entire loop execution, transferring control to the first statement following the loop block. This enables early exit from loops based on specific conditions.

• Switch exit: Within switch statements, break terminates statements terminate the switch block execution, preventing fallthrough to subsequent cases and transferring control to the code following the switch structure.

Example

// Prints numbers 0-4 in the console, then exits loop early
for (number i = 0; i < 10; i++) {
   if (i >= 5) {
      break;  // Terminates loop when i reaches 5
   }
   runnerLog(i);  // Only prints 0,1,2,3,4
}
// Execution continues here after break

Continue statement

The continue statement is used inside a loop (for, while). It provides a mechanism to skip the remaining code within the current loop iteration, immediately jumping to the loop’s next iteration.

Example

number i = 1;
while (i <= 10) {
    if (i % 3 == 0) {
        i++;        // Update counter before continue
        continue;         // Skip printing multiples of 3
    }
    runnerLog(i);            // Prints: 1,2,4,5,7,8,10
    i++;
}

Best practices for using statements in SIL

Following some simple best practices can prevent common pitfalls and ensure your code is maintainable, reliable, and efficient.

General

• Keep statement blocks concise and focused.

• Avoid mixing too many different control structures.

• Use meaningful variable names that indicate purpose.

• Add comments for complex logic or business rules.

• Test thoroughly.

• Include appropriate error-handling mechanisms. For example, validate inputs before processing, log or report errors.

• Keep your code well-organized by grouping related control structures.

• Maintain consistent indentation and formatting.

• Document complex control flow patterns.

If-else statements

• Keep conditions simple and readable.

• For multiple conditions, consider using switch statements instead.

• Avoid deeply-nested if statements (maximum 3-4 levels).

• Consider extracting complex conditions into separate boolean functions.

Switch statements

• Always include a default case for error handling.

• Use break statements consistently to prevent unintended fallthrough.

• Document intentional fallthrough cases with comments.

• Consider switch instead of if-else when comparing a single variable against multiple values.

For loops

• When the iteration count is known, use the standard form for loops.

• When processing arrays, preferably use for each loops.

• Initialize variables properly before the loop.

• Avoid modifying loop variables inside the loop body.

While loops

• Include safeguards against infinite loops.

• Ensure loop conditions can eventually become false.

• Initialize all variables before the loop.

• Validate loop variables have been properly updated.

• Use while when iteration count is unknown.Include

• safeguards against infinite loopsAdd timeout conditions for time-sensitive operations.

Do-while

loops

• Use when code must execute at least once. Best suited for validation scenarios.

• Keep the loop body focused on a single task.

• Ensure the condition can be met within the loop body.

Break statements

• Use to exit loops early when a condition is met.

• Avoid using multiple breaks in a single loop.

• Document the exit condition clearly.

• Consider extracting complex logic into separate functions.

Continue statement

• Use to skip iterations based on specific conditions.

• Place continue statements early in the loop body.

• Avoid multiple continue statements in a single loop.

• Ensure all necessary variables are updated before continue.

See also

• Syntax and types

• Operators

• Variable Resolution