linked-list exercise instructions are not clear

[edusa]

the exercise requires the implementation of push, pop, shift and unshift.

It should be made explicit what each of these mean. In my case I've started tackling this exercise as if I were working with a FIFO.

• The push() method adds new items to the top of the list.
• The pop() method removes (pops) the first item of the array.
• The shift() method rotates the items, moving the last to first.

Which strangely allowed me to advance on the exercise, until I had to implement unshift. Here I ended up finding a source online which described in the context of LL, what these methods might also mean.

• The push() method adds new items to the end of an array.
• The pop() method removes (pops) the last item of an array.
• The shift() method removes the first item of an array.
• The unshift() method adds new items to the beginning of an array.

I would kindly ask for these last four descriptions to be added to the file instructions.append.md.

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