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Small and medium business | Business Central, N...
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Guidance on Using Repetitive Statements and Conditions in AL Programming

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How do you use repetitive statements (loops) and conditions in AL programming for Business Central, and what are the best practices for choosing and using each type effectively?
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  • Suggested answer
    Yi Yong Profile Picture
    2,647 Super User 2026 Season 1 on at
    Hello,
     
    Here is a clean article that sums up the usage scenario.
     

    For loop: If you know the number of times to repeat the statement.

    While loop: Based on condition and may not be executed at all.

    Repeat-until loop: Based on condition and will execute at least once.
  • Gerardo Rentería García Profile Picture
    25,555 Most Valuable Professional on at
  • Suggested answer
    DAnny3211 Profile Picture
    11,417 Super User 2026 Season 1 on at
    hi
     
    For Loop:
     
    Use the for loop when you know the number of iterations needed. It is ideal for iterating over a range of values.

    for i := 1 to 10 do begin
        // Code to execute
    end;

     

    While Loop: Use the while loop when you want to execute a block of code as long as a condition is true. This loop might not execute at all if the condition is false initially.

     

    while i <= 10 do begin
        // Code to execute
        i := i + 1;
    end;

     

    Repeat-Until Loop: Use the repeat-until loop when you want to execute a block of code at least once and then repeat as long as a condition is true.

     

    repeat
        // Code to execute
        i := i + 1;
    until i > 10;

     

     

    Conditions

    If-Then-Else: Use the if-then-else statement to execute code based on a condition. You can include an else block to handle the case when the condition is false.

     

    if x = y then
        // Code to execute if the condition is true
    else
        // Code to execute if the condition is false

     

     

    case x of
        1: // Code for case 1
        2: // Code for case 2
        else
            // Code for all other cases
    end;

     

    regards
     

  • Verified answer
    Chavda Dharmendra Profile Picture
    1,000 Super User 2026 Season 1 on at
    Hello,
     
    I hope this can help you.
     

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