flatten-benchmark.js

const { Benchmark } = require("benchmark");
function generateRandomNumberBetween(min, max){
    return Math.floor(Math.random() * max) + min;
}
function generateTupleArray(length) {
    const tupleArray = [];
    for (let i = 0; i < length; i++) {
        tupleArray.push([generateRandomNumberBetween(1, 1e3), generateRandomNumberBetween(1, 1e3)]);
    }
    return tupleArray;
}
// Contains 100 arrays containing elements between 1 and 1000
const arrays = [];
for (let i = 0; i < 100; i++) {
    arrays.push(generateTupleArray(generateRandomNumberBetween(1, 1e3)))
}
const suite = new Benchmark.Suite();
suite.add("acc.concat(curr)", function() {
    for (const arr of arrays) {
        arr.reduce((acc, curr) => acc.concat(curr), []);
    }
});
suite.add("[...acc, ...curr]", function () {
    for (const arr of arrays) {
        arr.reduce((acc, curr) => [...acc, ...curr], []);
    }
});
suite.add("[].concat(...data)", function() {
    for (const arr of arrays) {
        [].concat(...arr);
    }
});
suite.on("cycle", function(event) {
    console.log(String(event.target));
});
suite.on("complete", function() {
    console.log("Fastest is " + this.filter("fastest").map("name"));
})
suite.run();