TypedArray 性能 http://weibo.com/1361535293/Fhvl8vmvh

typedarray.js

function test() {
  const a = new Int32Array(10);
  for (let i = 0; i < 1e6; i++) {
    a.set([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
  }
  return a;
}

console.time('test');
test();
console.timeEnd('test');

new Int8Array(1).set([0]);
new Uint8Array(1).set(['5']);
new Float32Array(1).set([NaN]);
new Float64Array(1).set([0.1]);

console.time('test');
test();
console.timeEnd('test');

The type feedback for the relevant internal function TypedArraySetFromArrayLike is polluted.
https://github.com/v8/v8/blob/e08cdc277ba089ca6ff01682eb877af9b1cdec38/src/js/typedarray.js#L254-L265

V8 性能优化计划：ES2015 and beyond performance plan