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JavaScript One Solution

Posted by fairest
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fairest
Full Stack JavaScript Techdegree Graduate 19,303 Points

Why not always use querySelector or querySelectorAll?

Why not always use querySelector or querySelectorAll?

mafk Goose
mafk Goose
170 Points

I'm sure you figured this out by now but querySelector(All) are slower when dealing with a ginormous amounts of information.

It is faster to compute when dealing with specific selectors. Typically it doesn't make much of a difference.

3 Answers

Dmitry Polyakov
Dmitry Polyakov
4,989 Points
Dmitry Polyakov
Dmitry Polyakov
4,989 Points

It's just a matter of preference. As for me for instance I like using getElementById as much as possible.

Jamie Reardon
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Jamie Reardon
Treehouse Project Reviewer
Jamie Reardon
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Jamie Reardon
Treehouse Project Reviewer

Depends on your "needs", querySelectorAll gets all elements associated with the value you enter and groups them into an array like element, therefore you could for example, loop through them.

querySelector on the other hand, only returns the first element from the top of the DOM tree.

Tall Toad
Tall Toad
2,746 Points
Tall Toad
Tall Toad
2,746 Points

Above comments makes sense to me now. I was getting the same results using querySelector/All, but Gill was using getElementsBy etc. I was confused why my code still worked. I used "for-in" loops instead of the "for" loop.