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jesusgoku/map-vs-reduce.js

Created July 25, 2024 20:37
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Array `.map()` vs `.reduce()`
Raw
map-vs-reduce.js
const size = 250_000;
const input = new Array(size).fill(undefined).map((_, index) => index);
[
{
name: '.map()',
fn: () => {
input.map((e) => e * 2);
}
},
{
name: '.reduce() and .push()',
fn: () => {
input.reduce((acc, e) => { acc.push(e * 2); return acc; }, new Array());
}
},
{
name: '.reduce() and new Array()',
fn: () => {
input.reduce((acc, e, index) => { acc[index] = e * 2; return acc; }, new Array(input.length));
}
},
].forEach(({ name, fn }) => {
const iterations = 2_000;
console.time(name);
for (let i = 0; i < iterations; ++i) {
fn();
}
console.timeEnd(name);
});
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