Livecode Wiki

Evaluates to true if the actual type of value is the specified type.Syntax:

<value> is strictly [ nothing | a boolean | an integer | a real | a string | a binary string | an array ]

Examples:

"Hello World!" is strictly a string -- evaluates to true
1 + 200 is strictly an integer -- evaluates to true
(100 is 100) is strictly a boolean -- evaluates to true
the compress of "Hello World!" is strictly a binary string -- evaluates to true

Use the is strictly operator to determine the true type of a value. The true type of a value is the representation which the engine is currently holding for it, without performing any implicit type coercion. The true type of a value can be one of the following:

  • nothing: no value, typically seen as empty
  • boolean: either true or false, typically seen as the result of a
 comparison operator
  • integer: a number with no fractional part
  • real: a number with a fractional part
  • string: a piece of text (sequence of characters)
  • binary string: a sequence of bytes
  • array: an associative array


The is strictly operator differs from is a in that it does not perform any type coercion. For example, `x is an integer` would return true if `x` is truly an integer or if it is a string which can be parsed as an integer; whereas `x is strictly an integer` only returns true if `x` is currently an integer (and not a string).

Parameters:

  • value: The expression to test the type of.

See also: is not a (operator),