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Run results for:
Test array concat with larger array
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<iframe src="https://measurethat.net/Embed?id=575933" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36
Browser:
Chrome 129
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
concat
3/s
in place
2/s
copy
1/s
View exact numbers
Test name
Executions per second
✓
concat
3 Ops/sec
in place
2 Ops/sec
copy
1 Ops/sec
HTML Preparation code:
<!--your preparation HTML code goes here-->
Script Preparation code:
/*your preparation JavaScript code goes here To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/ async function globalMeasureThatScriptPrepareFunction() { // This function is optional, feel free to remove it. // await someThing(); }
Tests:
copy
var getConcatenation = function(nums) { let ans = []; for (i = 0; i < nums.length; i++) { ans[i] = nums[i]; ans[i + nums.length] = nums[i]; } return ans; }; let largeArray = Array.from({ length: 10_000_000 }, (_, i) => i); getConcatenation(largeArray);
concat
var getConcatenation = function (nums) { return nums.concat(nums); }; let largeArray = Array.from({ length: 10_000_000 }, (_, i) => i); getConcatenation(largeArray);
in place
var getConcatenation = function(nums) { const len = nums.length; for (i = 0; i < len; i++) { nums[i + len] = nums[i]; } return nums; }; let largeArray = Array.from({ length: 10_000_000 }, (_, i) => i); getConcatenation(largeArray);
Spread operator
/** * @param {number[]} nums * @return {number[]} */ var getConcatenation = function (nums) { return [...nums, ...nums]; }; let largeArray = Array.from({ length: 10_000_000 }, (_, i) => i); getConcatenation(largeArray);