insert vs append vs push vs add
Use "insert" when the position matters. Use "append" for the end of a list or file, especially in Python. Use "push" for arrays in JavaScript or commits in Git. Use "add" when the data structure manages placement, like with sets or queues.
insert
Add an element at a specific position or index, shifting other elements to make room. The position matters. Also the standard verb for adding rows in SQL.
"list.insert(2, 'value') # inserts at index 2, shifting the rest"
append
Add an element at the end of a list or sequence. Used in Python, file I/O (append mode), and string building. The position is always the end.
"results.append(new_item) # adds to the end of the list"
push
Add an element to the end of an array. The standard term in JavaScript and most C-family languages. Also the word for sending commits to a remote repository in Git.
"items.push(newItem); // adds to the end of the array in JavaScript"
add
The most generic term. Used when the data structure manages placement internally, like a Set or a Queue, or when the exact position does not matter to the caller.
"uniqueIds.add(userId); // Set decides placement, caller doesn't specify"
Interview tip
When a interviewer asks how you add an element, choosing the right verb signals fluency. Saying "I push to the array" in a JavaScript context or "I append to the list" in Python sounds natural. Saying "I add to the array" is understood but sounds less precise.
Other comparisons
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