There is

Evaluates to true if the specified object, file, folder, or process exists, false otherwise.

Syntax:

there is a {object | file filePath | folder folderPath | process procName}

there is an {object | file filePath | folder folderPath | process procName}

The object can be any object.

The filePath specifies the name and location of a file you want to check. If you specify a name but not a location, LiveCode looks for the file in the defaultFolder.

The folderPath specifies the name and location of a folder you want to check. If you specify a name but not a location, LiveCode looks for the folder in the defaultFolder.

The procName is the name of any process that LiveCode started.

Examples

there is a card button 1 -- evaluates to true if any card buttons exist

if there is a card ID 3445 then go card ID 3445

put (there is a file it) into fileIsThere

if there is a folder "myFolder" then
 answer "Folder exists"
end if

Use the there is a operator to make sure an object or file exists before working with it, or to find out whether there are any objects of a specified type.

The there is a operator is the logical inverse of the there is no operator. When one is true, the other is false.

The expression there is a stack stackName evaluates to true if the stack is open, if it is closed but loaded into memory, or if it appears in the stackFiles property of any open stack.

NOTE: To find out whether a stack is open, check its mode property. A stack that is loaded into memory but is not open has a mode of zero.

Note: The there is a operator is implemented internally as a function, and therefore has lower precedence than other operators.

See also: stackFiles, mode, there is no, file,