Oct 31, 2008 · Append has (amortized) constant time complexity, O (1). Extend has time complexity, O (k). Iterating through the multiple calls to .append() adds to the complexity, …

The reason .extend is faster is because it does much less work. + will (1) create a list, copy all elements (references) from that list, then it will get the second list and add the references. …

Is there an article or forum discussion or something somewhere that explains why lists use append/extend, but sets and dicts use add/update? I frequently find myself converting lists into …

As we can see, extend with list comprehension is still over two times faster than appending. Generator expressions appear noticeably slower than list comprehension. append_comp only …

Nov 8, 2009 · 338 Extend is used when a use case adds steps to another first-class use case. For example, imagine "Withdraw Cash" is a use case of an Automated Teller Machine (ATM). …

Sep 8, 2020 · I saw this in a plugin: var options = $.extend(defaults, options); How does it work? What does extend() do?

In order to prevent having to specify all of the settings within the config object, I use jQuery's extend method to fill in a new object, settings with any default values from the default object if …

Sep 3, 2009 · 1523 There doesn't seem to be a way to extend an existing JavaScript array with another array, i.e. to emulate Python's extend method. I want to achieve the following:

Apr 8, 2015 · 22 As others have pointed out, extend takes an iterable (such as a list, tuple or string), and adds each element of the iterable to the list one at a time, while append adds its …

725 What is the best way to extend a dictionary with another one while avoiding the use of a for loop? For instance: