How insert data to array that is in another array

Question

I have array of array and i want to add data to inner array in javascript. Suppose my code is the following:

 self.basketsArray = [];
    self.newCollection = {
        books: []
    };
    self.basketsArray.push(self.newCollection);

  function addNewCollection(){
      self.basketsArray.push(self.newCollection);
  }
  function addDataToArray(index,index2){
     self.basketsArray[index].books.splice(index2, 1, data);
  }

In fact, when I want to add data to the inner array it adds to first inner array. What is my problem?

what should do addDataToArray? can you provide sample input and sample output for this? — Grundy
– Grundy, Commented Nov 15, 2015 at 11:38

devside · Accepted Answer · 2015-11-15 12:42:33Z

1

In javascript, you pass Objects and Functions by reference, others are just passed by value. You can either directly pass a new object or clone it.

// Directly push a new object: 
self.basketsArray.push({books: []}); 

// Clone it, using Angular
self.basketsArray.push(angular.copy({}, self.newCollection);); 

// Clone it, using Lodash
self.basketsArray.push(_.clone(self.newCollection));

Be aware that the libraries often propose shallow or deep cloning methods.

edited Nov 15, 2015 at 12:42

answered Nov 15, 2015 at 12:34

devside

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