What is fastest children or find in jQuery

Question

To select a child node in jQuery one can use children   but also find      For example     this  children   foo     gives the same result as     this  find   foo     Now  which option is fastest or preferred and why

User · Answer

Both find   and children   methods are used to filter the child of the matched elements  except the former is travels any level down  the latter is travels a single level down    To simplify    find       search through the matched elements    child  grandchild  great-grandchild    all levels down  children       search through the matched elements    child only  single level down

User · Answer

children   only looks at the immediate children of the node  while find   traverses the entire DOM below the node  so children   should be faster given equivalent implementations  However  find   uses native browser methods  while children   uses JavaScript interpreted in the browser   In my experiments there isn t much performance difference in typical cases   Which to use depends on whether you only want to consider the immediate descendants or all nodes below this one in the DOM  i e   choose the appropriate method based on the results you desire  not the speed of the method  If performance is truly an issue  then experiment to find the best solution and use that  or see some of the benchmarks in the other answers here

User · Answer

Here is a link that has a performance test you can run  find   is actually about 2 times faster than children

User · Answer

This jsPerf test suggests that find   is faster  I created a more thorough test  and it still looks as though find   outperforms children     Update  As per tvanfosson s comment  I created another test case with 16 levels of nesting  find   is only slower when finding all possible divs  but find   still outperforms children   when selecting the first level of divs   children   begins to outperform find   when there are over 100 levels of nesting and around 4000  divs for find   to traverse  It s a rudimentary test case  but I still think that find   is faster than children   in most cases   I stepped through the jQuery code in Chrome Developer Tools and noticed that children   internally makes calls to sibling    filter    and goes through a few more regexes than find   does   find   and children   fulfill different needs  but in the cases where find   and children   would output the same result  I would recommend using find

User · Answer

None of the other answers dealt with the case of using  children   or  find   gt    to only search for immediate children of a parent element  So  I created a jsPerf test to find out  using three different ways to distinguish children   As it happens  even when using the extra     selector   find   is still a lot faster than  children    on my system  10x so   So  from my perspective  there does not appear to be much reason to use the filtering mechanism of  children   at all

User · Answer

Those won t necessarily give the same result  find   will get you any descendant node  whereas children   will only get you immediate children that match   At one point  find   was a lot slower since it had to search for every descendant node that could be a match  and not just immediate children  However  this is no longer true  find   is much quicker due to using native browser methods

[jquery] What is fastest children() or find() in jQuery?

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