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In JavaScript, what is the best way to convert a NodeList to an array?

The DOM method document.querySelectorAll() (and a few others) return a NodeList.

To operate on the list, e.g. using forEach(), the NodeList must first be converted to an Array.

What's the best way to convert the NodeList to an Array?

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With ES6 you can simply do:

const spanList = [...document.querySelectorAll("span")];

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