darcien/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"/>
	<title>getUniqueList</title>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/1.0.0/benchmark.min.js"></script>
	<script src="./suite.js"></script>
</head>
<body>
	<h1>Open the console to view the results</h1>
	<h2><code>cmd + alt + j</code> or <code>ctrl + alt + j</code></h2>
</body>
</html>

## suite.js
"use strict";

(function (factory) {
	if (typeof Benchmark !== "undefined") {
		factory(Benchmark);
	} else {
		factory(require("benchmark"));
	}
})(function (Benchmark) {
	var suite = new Benchmark.Suite;

	Benchmark.prototype.setup = function () {
		let data = [
		  {
		    name: 'A',
		    age: 7,
		  },
		  {
		    name: 'B',
		    age: 12,
		  },
		  {
		    name: 'C',
		    age: 17,
		  },
		  {
		    name: 'A',
		    age: 23,
		  },
		];
	};


	suite.add("let getList = (data, key) => {", function () {
		let getList = (data, key) => {
		  return [...new Set(data.reduce((acc, item) => {
		    if (item.hasOwnProperty(key)) {
		      return acc.concat(item[key])
		    }
		    return acc;
		  }, []))]
		}

		getList(data, 'name');
	});

	suite.add("let getListMK2 = (data, key) => {", function () {
		let getListMK2 = (data, key) => {
		  let list = new Set(data.map(item => item[key]));
		  list.delete(null);
		  list.delete(undefined);
		  return [...list]
		}

		getListMK2(data, 'name');
	});

	suite.add("function getUniqueList(", function () {
		function getUniqueList(
		  list,
		  key,
		) {
		  return [...new Set(list.map((data) => data[key]))].filter(
		    (datum) => datum != null,
		  );
		}

		getUniqueList(data, 'name')
	});

	suite.on("cycle", function (evt) {
		console.log(" - " + evt.target);
	});

	suite.on("complete", function (evt) {
		console.log(new Array(30).join("-"));

		var results = evt.currentTarget.sort(function (a, b) {
			return b.hz - a.hz;
		});

		results.forEach(function (item) {
			console.log((idx + 1) + ". " + item);
		});
	});

	console.log("getUniqueList");
	console.log(new Array(30).join("-"));
	suite.run();
});
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8"/>
	<title>getUniqueList</title>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/benchmark/1.0.0/benchmark.min.js"></script>
	<script src="./suite.js"></script>
	</head>
	<body>
	<h1>Open the console to view the results</h1>
	<h2><code>cmd + alt + j</code> or <code>ctrl + alt + j</code></h2>
	</body>
	</html>
	"use strict";

	(function (factory) {
	if (typeof Benchmark !== "undefined") {
	factory(Benchmark);
	} else {
	factory(require("benchmark"));
	}
	})(function (Benchmark) {
	var suite = new Benchmark.Suite;

	Benchmark.prototype.setup = function () {
	let data = [
	{
	name: 'A',
	age: 7,
	},
	{
	name: 'B',
	age: 12,
	},
	{
	name: 'C',
	age: 17,
	},
	{
	name: 'A',
	age: 23,
	},
	];
	};


	suite.add("let getList = (data, key) => {", function () {
	let getList = (data, key) => {
	return [...new Set(data.reduce((acc, item) => {
	if (item.hasOwnProperty(key)) {
	return acc.concat(item[key])
	}
	return acc;
	}, []))]
	}

	getList(data, 'name');
	});

	suite.add("let getListMK2 = (data, key) => {", function () {
	let getListMK2 = (data, key) => {
	let list = new Set(data.map(item => item[key]));
	list.delete(null);
	list.delete(undefined);
	return [...list]
	}

	getListMK2(data, 'name');
	});

	suite.add("function getUniqueList(", function () {
	function getUniqueList(
	list,
	key,
	) {
	return [...new Set(list.map((data) => data[key]))].filter(
	(datum) => datum != null,
	);
	}

	getUniqueList(data, 'name')
	});

	suite.on("cycle", function (evt) {
	console.log(" - " + evt.target);
	});

	suite.on("complete", function (evt) {
	console.log(new Array(30).join("-"));

	var results = evt.currentTarget.sort(function (a, b) {
	return b.hz - a.hz;
	});

	results.forEach(function (item) {
	console.log((idx + 1) + ". " + item);
	});
	});

	console.log("getUniqueList");
	console.log(new Array(30).join("-"));
	suite.run();
	});