append, remove & pop

append — add to the end

JavaScript:

const fruits = ['apple', 'banana'];
fruits.push('cherry');

Python:

fruits = ["apple", "banana"]
fruits.append("cherry")

print(fruits)   # ["apple", "banana", "cherry"]

append() is Python's push() — it always adds to the end of the list.

remove — delete by value

Python's remove() deletes the first matching value, not an index.

fruits = ["apple", "banana", "cherry"]
fruits.remove("banana")

print(fruits)   # ["apple", "cherry"]

JS doesn't have a direct "remove by value" method — you'd normally write arr.filter(f => f !== 'banana') to get a new array without it.

Note: if the value doesn't exist, remove() raises an error, so make sure it's actually in the list first (more on checking that with in later in this phase).

pop — remove and return

pop() removes an item and gives it back to you.

fruits = ["apple", "banana", "cherry"]

last = fruits.pop()
print(last)      # "cherry"
print(fruits)    # ["apple", "banana"]

Just like JS's arr.pop(). But Python's pop() also accepts an index, which JS's pop() doesn't support directly:

fruits = ["apple", "banana", "cherry"]

first = fruits.pop(0)
print(first)     # "apple"
print(fruits)    # ["banana", "cherry"]