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Ok, what you're trying to achieve is to basically "toggle" items in the array, right?

I'd suggest you to try this: In your dddd method (Awful name btw):

dddd = (selectedItem) => {
  const { listofdata } = this.state;

  const newList = [ ...listofdata ];

  const itemIndex = newList.findIndex(item => item.name === selectedItem.name);

  if (itemIndex > -1) {
    newList.splice(itemIndex, 1);
  } else {
    newList.push(selectedItem);
  }

  this.setState({
    listofdata: newList,
  })
}

Hope it helps!