how to update specific key of an object in reducer

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1case COMPLETE_TODO: {
2  const index = state.todos.findIndex(todo => todo.id === action.payload); //finding index of the item 
3  const newArray = [...state.todos]; //making a new array 
4  newArray[index].completed = true//changing value in the new array 
5  return {   ...state, //copying the orignal state  
6          todos: newArray, //reassingning todos to new array 
7         }
8}

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