nl_tokens: This supports an internal settable value that the fn can derive its value from . It s useful to can - define . new SettableObservable ( function ( lastSet ) { return lastSet * 5 ; } null 5 )
pl_tokens: function SettableObservable ( fn , context , initialValue ) { this . lastSetValue = new SimpleObservable ( initialValue ) ; function observe ( ) { return fn . <mask> ( context , this . lastSetValue . get ( ) ) ; } this . handler = this . handler . bind ( this ) ; //!steal-remove-start if ( process . env . NODE_ENV !== 'production' ) { canReflect . assignSymbols ( this , { "can.getName" : function ( ) { return ( canReflect . getName ( this . constructor ) + "<" + canReflect . getName ( fn ) + ">" ) ; } } ) ; Object . defineProperty ( this . handler , "name" , { value : canReflect . getName ( this ) + ".handler" } ) ; Object . defineProperty ( observe , "name" , { value : canReflect . getName ( fn ) + "::" + canReflect . getName ( this . constructor ) } ) ; } //!steal-remove-end this . observation = new Observation ( observe , this ) ; }