Curious about the speed variations between arrays and objects, I decided to conduct a test involving filling, accessing, and deleting 100,000 items from both. Surprisingly, accessing and filling the array showed minimal difference with only about ~3ms gap. But when it came to deleting, there was a significant delay of 604ms compared to just 10ms for the object (614ms vs 10ms). This made me question my assumption that objects and arrays were essentially the same.
Check out the demo here::
When utilizing the .splice() method, it necessitates reassigning all subsequent array entries. Essentially, each property name following the spliced entry must be updated. Unfortunately, there is no efficient way to accomplish this other than performing a straightforward linear traversal of the properties. Creating a data structure that could expedite this operation would result in an impact on the speed of more common operations.
Let's take the array [1, 2, 3, 4] as an example. Initially, the value of property "0" is 1. After splicing out this entry, the runtime must adjust property "0" to 2, property "1" to 3, and property "2" to 4.
When it comes to manipulating arrays, there are different methods you can use. The "delete" method simply sets the array position to undefined, while the splice method completely removes the element by shifting all subsequent elements down one position. This process involves a loop that reassigns values in the array to fill in the gap left by the removed element. If you want to learn more about this topic, you can check out this helpful question.
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