$isNumber

The function $isNumber[value] checks if a value is a number, whether integer, decimal, positive or negative. More permissive than $isInteger[].

Syntax

$isNumber[value]

Parameters

Parameter	Description
value	The value to test.

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, or empty.

Behavior

• Accepts integers and decimals.
• Accepts negative numbers.
• Does not accept scientific notation (1e5).
• Does not accept thousands separators (1,000).

Examples

Price validation

$var[price;$message[1]]
$if[$isNumber[$var[price]]==true]
  $if[$var[price]>=0]
    $var[tax;$math[$var[price]*0.2]]
    $sendMessage[💰 Price: $var[price]€ | VAT: $var[tax]€ | Total: $math[$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] = $math[$var[a]+$var[b]]]
  $sendMessage[📊 $var[a] × $var[b] = $math[$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[].