Move an element to an array to another array

Question

Suppose we have arrays x = ['a', 'b', 'c'] and y . Is there an easy way to move, say, the second element of x , to y ? So, at the end of << 22> ['a', 'c'] and y is ['b'] .

Answer 1

yep, it will look like this:

 y.push x.delete_at(1) 

delete_at will remove the element with the given index from the array it called on, and return this object

Answer 2

Special code for this example. Perhaps this will not work on your other arrays. Instead of actually moving the element, let's split the old array and build two new arrays.

 x = ['a', 'b', 'c'] x, y = x.partition {|i| i != 'b'} x # => ["a", "c"] y # => ["b"] 

The delete_at approach is probably better for your situation, but you know it's good to know the alternatives :)

Answer 3

Yes. For a specific item:

 y = [] y << x.delete('b') 

For a specific index:

 y = [] y << x.delete_at(1) 

This material is well documented , by the way.

Answer 4

 x = ['a', 'b', 'c'] y = [] 

Index removal:

 y << x.delete_at(1) 

Delete by object:

 y << x.delete('b')