Coding Example: Modifying the list

This coding example will help you go through a simple and straightforward solution to add, delete, and set items in a list.

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Modification of the list is a little complicated, because it requires managing the memory properly. The solution is pretty straightforward as it poses no real difficulty. You can have a look at the code below (the comments are added at each step to help you understand what’s happening).

Note: Always be careful with negative steps, key range and array expansion. When the underlying array needs to be expanded, it’s better to expand it more than necessary in order to avoid future expansion.

setitem

L[1] = 1,1,1

╌╌╌╌┬───┬───┐┌───┬───┐┌───┬───┬╌╌╌╌╌
    │ 0 │ 0 ││ 1 │ 1 ││ 2 │ 2 │
 ╌╌╌┴───┴───┘└───┴───┘└───┴───┴╌╌╌╌╌╌
     item 1   item 2   item 3


OUTPUT
╌╌╌╌┬───┬───┐┌───┬───┲━━━┓┌───┬───┬╌╌╌╌╌
    │ 0 │ 0 ││ 1 │ 1 ┃ 1 ┃│ 2 │ 2 │
 ╌╌╌┴───┴───┘└───┴───┺━━━┛└───┴───┴╌╌╌╌╌╌
     item 1     item 2     item 3

delitem

L = TypedList([[0,0], [1,1], [0,0]])
del L[1]

╌╌╌╌┬───┬───┐┏━━━┳━━━┓┌───┬───┬╌╌╌╌╌
    │ 0 │ 0 │┃ 1 ┃ 1 ┃│ 2 │ 2 │
 ╌╌╌┴───┴───┘┗━━━┻━━━┛└───┴───┴╌╌╌╌╌╌
     item 1   item 2   item 3


OUTPUT
╌╌╌╌┬───┬───┐┌───┬───┬╌╌╌╌╌
    │ 0 │ 0 ││ 2 │ 2 │
 ╌╌╌┴───┴───┘└───┴───┴╌╌╌╌╌╌
     item 1    item 2

insert

L = TypedList([[0,0], [1,1], [0,0]])
L.insert(1, [3,3])

╌╌╌╌┬───┬───┐┌───┬───┐┌───┬───┬╌╌╌╌╌
    │ 0 │ 0 ││ 1 │ 1 ││ 2 │ 2 │
 ╌╌╌┴───┴───┘└───┴───┘└───┴───┴╌╌╌╌╌╌
     item 1   item 2   item 3


OUTPUT
╌╌╌╌┬───┬───┐┏━━━┳━━━┓┌───┬───┐┌───┬───┬╌╌╌╌╌
    │ 0 │ 0 │┃ 3 ┃ 3 ┃│ 1 │ 1 ││ 2 │ 2 │
 ╌╌╌┴───┴───┘┗━━━┻━━━┛└───┴───┘└───┴───┴╌╌╌╌╌╌
     item 1   item 2   item 3   item 4