Wrong increment of dates in a while statement-CodePudding

i'm working on a code that increments a date of an object in a while statement and put in an array at every iteration, i can't understand why but when i print the array on the console, the incremented date is alwais on the last day incremented, the code is here:

 while (Difference_In_Days > 1) {

            var assTemp = new assenza()
            Difference_In_Days = date2.getDate() - date1.getDate();
            assTemp.data_ass = date1
            assTemp.id_ass = 0
            assTemp.motivo = ""   motivo
            assTemp.dipendente = this.dipendente
            this.assArr.push(assTemp)
            var assTemp = new assenza()
            date1.setDate(date1.getDate()   1)
        }

and the result of the console.log(JSON.stringify(this.assArr)):

[ { "id_ass":0, "data_ass":"2021-10-15T00:00:00.000Z", "motivo":"salute", "dipendente":{} },

{ "id_ass":0, "data_ass":"2021-10-15T00:00:00.000Z", "motivo":"salute", "dipendente":{} },

{ "id_ass":0, "data_ass":"2021-10-15T00:00:00.000Z", "motivo":"salute", "dipendente":{} } ]

as you can see the data_ass(the dates) are always the same, why? if i put a console.log of date1 in the while it shows me a correct increment day by day trough the iterations. thanks for your help

CodePudding user response：

You simply need to copy date1 to assTemp.data_ass, rather than assigning the reference, by changing the line

assTemp.data_ass = date1

assTemp.data_ass = new Date(date1);

Otherwise each instance of assTemp will hold the same value for data_ass, namely the last value.