Conditional update

Atomically sets the value to the given updated value if the current value == the expected value.

// *******************************************
// Backendless.Counters approach
// *******************************************
Backendless.Counters.compareAndSet( counterName, expected, updated )
 .then( function( result ) {
 })
 .catch( function( error ) {
 });

// *******************************************
// Backendless.Counters.of() approach
// *******************************************
var counter = Backendless.Counters.of( counterName );
counter.compareAndSet( expected, updated )
 .then( function( result ) {
 })
 .catch( function( error ) {
 });

where:

Argument	Description
counterName	name of the counter to update.
expected	the expected value of the counter. If the current value equals the expected value, the counter is set to the "updated" value.
updated	the new value to assign to the counter if the current value equals the expected value.

Example

var successCallback = function( response ) {
  console.log( "has the counter been updated? - " + response );
};

var failureCallback = function( fault ) {
  console.log( "error - " + fault.message );
};

// ************************************************
// Backendless.Counters approach
// ************************************************
Backendless.Counters.compareAndSet( "my counter", 1000, 2000 )
 .then( successCallback )
 .catch( failureCallback );

// ************************************************
// Backendless.Counters.of() approach
// ************************************************
var myCounter = Backendless.Counters.of( "my counter" );

myCounter.compareAndSet( 1000, 2000 )
 .then( successCallback )
 .catch( failureCallback );