$linesCount — Count Lines

$linesCount returns the number of lines in a string. A line is defined as text terminated by a newline character (\n). Even a single word with no newline counts as 1 line.

Syntax

$linesCount[text]

Parameters

• text (string, required) — The text whose lines to count.

Return Value

• Type: string (representing a number)
• Returns the line count. An empty string returns "0". A string without newlines returns "1".

Usage

$linesCount[hello]          → "1"
$linesCount[line1\nline2]   → "2"
$linesCount[]               → "0"

With actual newlines in code:

$linesCount[First line
Second line
Third line]
→ "3"

Common Patterns

Limit Multi-Line Input

$if[$linesCount[$message]>10]
  $sendMessage[Your message has too many lines (max 10).]
  $stop
$endif

Code Block Validation

$if[$linesCount[$getUserVar[code]]>50]
  $sendMessage[Code too long — max 50 lines.]
$endif

Display Line Count

$sendMessage[Your submission: $linesCount[$message] lines, $charCount[$message] characters]

Important Notes

• Trailing newline: A trailing \n may or may not create an additional empty line depending on the BDFD runtime. Test your specific version.
• Empty string = 0: Different from a single non-empty line which returns "1".
• Return type: The return value is a string, compatible with numeric comparisons in $checkCondition and $math.