CODEWITHSUNDEEP
javascript
Rounak Jain
Rounak Jain

Reputation: 499

How to remove a key value pair from object while updating values of remaining objects?

const initialState = {
    loading: null,
    error: null,
    lineItems: [
         {
             id: 1, 
             product_name: "Elbow 15", 
             product_disc: 1, 
             sub_total: 5548.95, 
             product_unit: "Nos", 
             …
         }
         {
             id: 2, 
             product_name: "Tee 15", 
             product_disc: 3, 
             sub_total: 24.25, 
             product_unit: "Nos", 
             …
         }
         {
             id: 3, 
             product_name: "", 
             product_disc: 0, 
             sub_total: 0
         }
    ]

lineItems represent rows in a grid (I am using react-data-grid)

id property values are used to populate the first column ("Serial Number") of the grid

If a user deletes a row (e.g. middle object in the above case), how to update the above object, so that is becomes

  lineItems: [
        {
            id: 1, 
            product_name: "Elbow 15", 
            product_disc: 1, 
            sub_total: 5548.95, 
            product_unit: "Nos", 
            …
        }
        {
            id: 2, 
            product_name: "", 
            product_disc: 0, 
            sub_total: 0
        }
    ]

Upvotes: 0

Views: 67

Answers (2)

Ammar Tariq
Ammar Tariq

Reputation: 847

You can use delete keyword to delete specific key from your object.

delete object['key']

Upvotes: 1

Barmar
Barmar

Reputation: 780724

You can use delete to remove a property from an object. Then you'll need to loop through the remaining properties and update their keys and the id properties within them.

function removeLineItem(state, index) {
  delete state.lineItems[index];
  Object.keys(state.lineItems).forEach(k => {
    if (state.lineItems[k].id > index) {
      state.lineItems[k].id = k - 1; // decrement id
      state.lineItems[k - 1] = state.lineItems[k]; // decrement key
      delete state.lineItems[k]; // remove old key
    }
  });
}

const initialState = {
  loading: null,
  error: null,
  lineItems: {
    0: {
      id: 1,
      product_name: "Elbow 15",
      product_disc: 1,
      sub_total: 5548.95,
      product_unit: "Nos",
    },
    1: {
      id: 2,
      product_name: "Tee 15",
      product_disc: 3,
      sub_total: 24.25,
      product_unit: "Nos",
    },
    2: {
      id: 3,
      product_name: "",
      product_disc: 0,
      sub_total: 0
    }
  }
};

removeLineItem(initialState, 1);
console.log(initialState);

Upvotes: 1

Related Questions