ananas | A C++11 RPC framework

You can just take the set of fruits present in your df1 and use them to filter df2, then bind them together.

If it is a large data.frame, it may be more efficient to use vectorized solution instead of looping over rows. Get the logical index of elements in 'col1' that are NA ('i1'), use max.col to return the column index of first non-NA element from columns 3 to 5 ('j1'), create a row/column index matrix (m1) with cbind, assign the 'col1' where there are missing values with the elements extracted from 3 to 5 columns using 'm1' and assign those elements to NA

Using substr:

What you probably want is match

I think you may need to use sparse matrices. Package Matrix has such a possibility. You can learn more about sparse matrices at: Sparse matrix

I don't really understand what you want from your description, but you can accomplish your desired data.frame by grouping it by fruits:

I wouldn't remove anything from dataset. Instead I'd build a new map from scratch, with just the data you want.

How about:

Another possible solution could be based on an hand-knitted model and controller logic.

One would entirely separate the pure controller tasks, letting them only work directly with the DOM and with a modeled abstraction of the initially provided list items/values.

The model itself could be e.g. a Map based registry which implements the logic of always being in control of the correct list state.

Thus, in addition to the most obvious register/deregister methods, there will be sanitizing and check tasks that prevent e.g. double registering of (potentially) equal items/values. Such a registry model could also provide getters for special list representations of its registered items like e.g. providing the current array of just each item's text content or an array of each item's model.

As for the latter, such a model in addition to e.g. its id and text value would also feature its own view, e.g. an elm reference of the to be rendered/removed element node.

In order to keep each item specific DOM node and/or each item's model free of controller logic, the main controller task uses event delegation ^[1],[2] by listening to / handling the double-click event at the list's root-node exclusively.

The next provided example code demonstrates how the main controller task operates both the DOM and the item list abstraction ...

In order to have both the searchView and the share button on the toolbar your activity must look like the this: