First we can do a function-by-function comparison, which looks at some of the most commonly used functions. In the following table, “$” means “jQuery”, and “#” means “.prototype.”:
Lastly, and most importantly, CSS selectors are what most people use these two frameworks for, and there are many methods to query objects in the DOM to get their children that match a name, ID, or class name, which are all subsumed by jQuery’s find() method and Prototype’s getElementsBySelector() method. While the two libraries do support slightly different gamut of selector syntax, they’re mostly the same. Just remember to add the extra $ if you’re using Prototype.
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