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. …

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, …

Sep 23, 2010 · The extend method for example in jQuery or PrototypeJS, copies all properties from the source to the destination object. Now about the prototype property, it is a member of …

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 · 336 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?

Python "extend" for a dictionary Asked 16 years, 7 months ago Modified 2 years, 10 months ago Viewed 551k times

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 …

Mar 11, 2025 · Starting from TailwindCSS v4, a CSS-first configuration is preferred. Check my answer to see what this means. I also explain how you can still use tailwind.config.js in v4.

Sep 3, 2009 · To extend an existing JavaScript array with another array without creating a new one, you can use the push () method combined with the spread operator .... Here’s how: