There doesn't appear to be a way to get the results directly from document.evaluate().
Taking the concept from this answer, one could get a snapshot result, create an array filled with dummy values (e.g. 0s) and then map calls to snapshotItem().
const query = document.evaluate("//*[@*[starts-with(name(), 'temp')]]", document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null); const results = Array(query.snapshotLength).fill(0).map((element, index) => query.snapshotItem(index)); console.log(results);<div temp-callback="1" temp-post-callback="4"></div> <div temp-callback="2"></div> <div></div> <div temp-callback="8" temp-post-callback="7"></div>While less of a functional programming approach, one could also just use a for loop:
const query = document.evaluate("//*[@*[starts-with(name(), 'temp')]]", document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null); for (var i=0, results = []; i< query.snapshotLength; results.push(query.snapshotItem(i++))); console.log(results);<div temp-callback="1" temp-post-callback="4"></div> <div temp-callback="2"></div> <div></div> <div temp-callback="8" temp-post-callback="7"></div>Additionally, given the last example of Equivalent constructs, the while loop could be rewritten as a for loop as well:
for ( ; condition; ) { statements; } So the original code could be written as such:
var nodes = []; for(var node = result.iterateNext(); node; node = result.iterateNext()) { nodes.push(node); } See this demonstrated in the snippet below:
var result = document.evaluate("//*[@*[starts-with(name(), 'temp')]]", document, null, XPathResult.ANY_TYPE, null); var nodes = []; for(var node = result.iterateNext(); node; node = result.iterateNext()) { nodes.push(node); } console.log(nodes);<div temp-callback="1" temp-post-callback="4"></div> <div temp-callback="2"></div> <div></div> <div temp-callback="8" temp-post-callback="7"></div>Performance Comparison
###Performance Comparison CompareCompare the four approaches with this jsperf example. In Chrome, Firefox, and MS Edge it reports that the original code is the fastest.
