Syntax

$isNumber[value]

Parameters

Parameter	Description
value	The value to test. Required, exactly one argument.

Return Value

• Type : Boolean
• true if value is a number (e.g. 42, -7, 3.14, 0.001)
• false if value is text, a boolean, empty, or not finite (NaN, Infinity, 1e999).

Behavior

• Leading and trailing spaces are ignored: $isNumber[ 5 ] → true.
• Accepts integers and decimals, with an optional + or - sign: 42, -7, +5, 3.14, .5, 5..
• Accepts scientific notation: 1e5 → true (but 1e → false).
• Accepts integers with a 0x (hexadecimal), 0b (binary) or 0o (octal) prefix: 0x1F → true. A bare 0x is false.
• Does not accept thousands separators (1,000) or inner spaces (5 5).
• A value that is NaN, Infinity, or too large to be finite (1e999) is false.

Examples

Price validation

$var[price;$message[1]]
$if[$isNumber[$var[price]]==true]
  $if[$var[price]>=0]
    $var[tax;$calculate[$var[price]*0.2]]
    $sendMessage[💰 Price: $var[price]€ | VAT: $var[tax]€ | Total: $calculate[$var[price]+$var[tax]]€]
  $else
    $sendMessage[❌ The price must be positive.]
  $endif
$else
  $sendMessage[❌ Please enter a valid number.]
$endif

Simple calculator

$var[a;$message[1]]
$var[b;$message[2]]
$if[$isNumber[$var[a]]==true&&$isNumber[$var[b]]==true]
  $sendMessage[📊 $var[a] + $var[b] = $calculate[$var[a]+$var[b]]]
  $sendMessage[📊 $var[a] × $var[b] = $calculate[$var[a]*$var[b]]]
$else
  $sendMessage[❌ Please enter two valid numbers.]
$endif

Complete type detection

$var[val;$message[1]]
$if[$isInteger[$var[val]]==true]
  $sendMessage[🔢 Integer]
$elseif[$isNumber[$var[val]]==true]
  $sendMessage[🔣 Decimal number]
$elseif[$isBoolean[$var[val]]==true]
  $sendMessage[📌 Boolean]
$else
  $sendMessage[📝 Text]
$endif

Notes

• $isNumber[42] returns true.
• $isNumber[3.14] returns true.
• $isNumber[-5.5] returns true.
• $isNumber[true] returns false.
• To accept only integers, use $isInteger[].