DQ_Push ( deque ; value )

Push an item onto the front (top) of a double-ended queue

Average rating: 4.7 (26 votes) Log in to vote

Stephen Hanna
Stephen J. Hanna Consulting
http://www.sjhanna.com

Sample input:

DQ_Push( $myList ; "item" )

Sample output:

(none)

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

//	D E Q U E   M A N I P U L A T I O N   F U N C T I O N S
//
//	Function Name:	DQ_Push
//	Parameters:	deque	The name (as a text string) of the global variable containing the list of values
//			value	The value to be added to the front (top) of the list
//	Returns:	deque
//	Side Effects:	deque	now has value added as its new first element
//	Exceptions:	Returns '?' if deque does not contain a valid variable name
//

Let (	[ $__A = deque
	; $__B = Quote( List( value; Evaluate( deque ) ) )
	]
	; Evaluate( "Let (" & $__A & " = " & $__B & "; $__A )" )
)

This is a "push" function for a package that implements a double-ended queue (DeQue, sometimes pronounced "deck"). See the description of DQ_New() for details. A typical usage sequence would be:

Set Variable [ "$myStack" ; DQ_New ( "apple" ) ) ]
Set Variable [ "$dummy" ; DQ_Push ( $myStack ; "banana" ) ]

Comments

		Gianandrea Gattinoni, Milano Jan 4, 2015
you need to put in quote the variable name: DQ_Push ( "$myStack" ; "banana" ) and the function returns the varable name

Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

DQ_Push ( deque ; value )

Comments

Support this website.

Support this website.